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Showing 1-100 of 115 Resources
  • Nature’s Cutest Symbiosis: The Bobtail Squid

    Nature’s Cutest Symbiosis: The Bobtail Squid

    Feature Film

    (8 min 5 sec) The bobtail squid is an underwater delicacy for many predators, so the creature found a handy superpower to stay alive: Invisibility

  • Termites Digest Wood Thanks To Microbes

    Termites Digest Wood Thanks To Microbes

    Feature Film

    (7 min 11 sec) The next time you spot a termite chomping down on wood, know that they’re not dining alone.

  • Fellow Travelers

    Fellow Travelers

    Image of the Week

    The human body is home to some thirty-nine trillion microbes that live in or on it.

  • Portrait of a Howler

    Portrait of a Howler

    Image of the Week

    Groups of black howler monkeys (Alouatta caraya) “howl” to each other in the Amazon rainforest during the evening and early morning hours in order to maintain neighborly distances.

  • Benefits of Schools

    Benefits of Schools

    Image of the Week

    Being in a school affords young barracuda several advantages over the solitary life.

  • Firefly Pyrotechnics

    Firefly Pyrotechnics

    Image of the Week

    Most firefly species employ characteristic patterns of bioluminescent flashes to elicit responses from potential mates.

  • How Lizards Find Their Way Home

    How Lizards Find Their Way Home

    Scientists at Work

    (8 min 33 sec) When Dr. Manuel Leal removed lizards from an area in the forest, he noticed an interesting phenomenon: all the lizards seemed to be back the next day. Watch as he sets up an experiment to study how these lizards navigate home. Also available in Spanish.

  • Dad Feathers

    Dad Feathers

    Image of the Week

    The male peafowl, or peacock, invests a lot in his appearance.

  • Root Movement

    Root Movement

    Image of the Week

    Root tips constantly search the soil for water and nutrients using the power of cell division and elongation.

  • Studying Elephant Communication

    Studying Elephant Communication

    Scientists at Work

    (6 min 43 sec) Elephants can communicate over long distances using low-frequency sounds that travel both in the air and through the ground. Scientists are studying whether elephants can “hear” and interpret these ground vibrations.

  • Bat Echolocation

    Bat Echolocation

    Data Point

    In this study, researchers tested whether bats change their behavior while hunting based on feedback from echolocation.

  • Sharklab

    Sharklab

    Image of the Week

    A team of scientists from The Bimini Biological Field Station collecting samples from a male tiger shark (Galeocerdo cuvier).

  • How Animals Use Sound to Communicate

    How Animals Use Sound to Communicate

    Click & Learn

    Using elephants, finches, bats, and moths, as case studies, explore different aspects of how animals use sound to communicate.

  • Following the Matriarch

    Following the Matriarch

    Image of the Week

    A herd of elephants moving across the floodplain grassland of Gorongosa National Park.

  • Undersea Fireworks

    Undersea Fireworks

    Image of the Week

    The tentacles of sea anemones contain thousands of stinging cells called nematocysts that are ready to fire for defense or attack. 

  • WildCam Lab

    WildCam Lab

    Click & Learn

    The WildCam Lab is a part of WildCam Gorongosa, an online citizen science platform where users identify animals in trail camera photos. Using the WildCam Lab, students can investigate ecological questions and test hypotheses by exploring trail camera data using an interactive map. 

  • Social Networking

    Social Networking

    Image of the Week

    The arrangement of nerve cells in the region of the brain called the hippocampus is essential for the formation and storage of new memories.

  • Mozambique Mounds

    Mozambique Mounds

    Image of the Week

    Termite mounds in central Mozambique appear as regularly spaced islands of dark-green vegetation in a sea of grassland. 

  • Wait for Me!

    Wait for Me!

    Image of the Week

    A remote trail camera captures a photo of an elephant calf trying to catch up to the rest of its family group in Gorongosa National Park.

  • WildCam Gorongosa

    WildCam Gorongosa

    Click & Learn

    Researchers in Gorongosa National Park use remote trail cameras to study the park’s wildlife. You can contribute to this important research through WildCam Gorongosa, an online citizen science platform.

  • Schooling Behavior of Stickleback Fish from Different Habitats

    Schooling Behavior of Stickleback Fish from Different Habitats

    Data Point

    A team of scientists studied the schooling behavior of threespine stickleback fish by experimentally testing how individual fish responded to an artificial fish school model.

  • School's Back!

    School's Back!

    Image of the Week

    Golden shiner fish (Notemigonus crysoleucas) stay in school for the shade.

  • Tick Hiker

    Tick Hiker

    Image of the Week

    An adult female Blacklegged tick (Ixodes scapularis), commonly known as the deer tick, awaits passing wildlife. 

  • Shades of Pollen

    Shades of Pollen

    Image of the Week

    The variety of colors of cells in a honeycomb comes from pollen collected from different plant species.

  • Dottyback in Damselfish Clothing

    Dottyback in Damselfish Clothing

    Image of the Week

    Dottyback fish change color by altering the proportions of yellow and black pigment cells in their skin to mimic Damselfish.

  • The Art of Hiding

    The Art of Hiding

    Image of the Week

    Animal mimics evolved markings that make them look either like other animals or inanimate objects.

  • Save Our Sawfish

    Save Our Sawfish

    Image of the Week

    A smalltooth sawfish (Pristis pectinata) patrols the murky waters of the Everglades National Park in Florida.

  • Warthog Love

    Warthog Love

    Image of the Week

    Warthog mothers look after their young in small family groups.

  • Following Tracks In The Sky

    Following Tracks In The Sky

    Image of the Week

    The flight patterns of a flock of black vultures are revealed by a novel digital video technique.

  • The Lone Anole

    The Lone Anole

    Image of the Week

    The Plymouth anole (Anolis lividus) lizard is found only on the Caribbean island of Montserrat—and it is the only anole species living there.

  • Fruit Fly Art

    Fruit Fly Art

    Image of the Week

    Tracking the flight paths and speeds of fruit flies in a wind tunnel may help design better flying robots.

  • Holiday Lecture 2004 Update—Jeff Friedman

    Holiday Lecture 2004 Update—Jeff Friedman

    Clip

    (3 min 52 sec) HHMI investigator Jeff Friedman provides an update to his 2004 lectures on obesity.

  • Counting the Chirps of Fall

    Counting the Chirps of Fall

    Image of the Week

    A close-up view of the sound-producing structure on the wing of a field cricket (Gryllus pennsylvanicus).

  • Putting Food on the Table

    Putting Food on the Table

    Image of the Week

    Weaver ants labor to carry a live land snail back to their nest in Gorongosa National Park.

  • Lizard Evolution Virtual Lab

    Lizard Evolution Virtual Lab

    Virtual Lab

    In the Lizard Evolution Virtual Lab students explore the evolution of the anole lizards in the Caribbean by collecting and analyzing their own data.  

  • Dinner Date

    Dinner Date

    Image of the Week

    The male peacock spider performs a spectacular dance to attract a mate—but the female is not always impressed.

  • Holding on to Your Mother

    Holding on to Your Mother

    Image of the Week

    Infant lemurs hitch a ride through the forest by holding on to their mother’s tummy or riding piggyback.

  • Good Moms Come in All Shapes and Sizes

    Good Moms Come in All Shapes and Sizes

    Image of the Week

    Female peacock spiders stay with their young in an egg sac until they can fend for themselves. 

  • Grasping Your Inner Monkey

    Grasping Your Inner Monkey

    Image of the Week

    The shape of our hands comes from tree-dwelling ancestors.

  • Beaks As Tools: Selective Advantage in Changing Environments

    Beaks As Tools: Selective Advantage in Changing Environments

    Activity

    This classroom experiment supports the film The Origin of Species: The Beak of the Finch. Students collect and analyze data to learn why even slight variations in beak size can make the difference between life and death.

  • Using DNA to Explore Lizard Phylogeny

    Using DNA to Explore Lizard Phylogeny

    Activity

    This activity supports the film The Origin of Species: Lizards in an Evolutionary Tree. Students are guided to sort the lizard species by appearance, then generate a phylogenetic tree using the lizards’ DNA sequences to evaluate whether species that appear similar are closely related to each other.

  • Anole Lizards: An Example of Speciation

    Anole Lizards: An Example of Speciation

    Animation

    (2 min 38 sec) This animation features the anole lizards as an example of how a single species can split and multiply into many different species with distinct traits.

  • Film Guides: The Origin of Species: Lizards in an Evolutionary Tree

    Film Guides: The Origin of Species: Lizards in an Evolutionary Tree

    Film Guide

    The following classroom-ready resources complement The Origin of Species: Lizards in an Evolutionary Tree. Research on the anole lizards is enriching our understanding of evolutionary processes, such as adaptation by natural selection, convergent evolution, and the formation of new species. Also available in Spanish.

  • Film Guides: The Origin of Species: The Beak of the Finch

    Film Guides: The Origin of Species: The Beak of the Finch

    Film Guide

    The following classroom-ready resources complement The Origin of Species: The Beak of the Finch. By following four decades of research on the finches of the Galápagos islands, the film illustrates how geography and ecology can drive the evolution of new species.

  • Sorting Finch Species

    Sorting Finch Species

    Click & Learn

    Finches discriminate between members of their own species and those of a closely related species based on song and appearance.

  • The Origin of Species: Lizards in an Evolutionary Tree

    The Origin of Species: Lizards in an Evolutionary Tree

    Short Film

    (17 min 45 sec) In the Caribbean islands, adaptation to several common habitats has led to a large adaptive radiation with interesting examples of convergent evolution. Also available in Spanish.

  • The Origin of Species: The Beak of the Finch

    The Origin of Species: The Beak of the Finch

    Short Film

    (15 min 54 sec) Four decades of research on finch species that live only on the Galápagos Islands illuminate how species form and multiply. Also available in Spanish.

  • Comparing Human and Chimpanzee Tool Use

    Comparing Human and Chimpanzee Tool Use

    Clip

    (29 sec) Chimpanzees are capable of using rocks as tools to crack nuts for eating. But they don't appear to use sharp-edged tools.

  • Dung Beetles and their Fossilized Evidence

    Dung Beetles and their Fossilized Evidence

    Clip

    (39 sec) Fossilized dung beetle balls are part of a comprehensive fossil collection project to reconstruct the habitat of Ardipithecus ramidus.

  • Classroom Activities: Factors That Affect the Mosquito Life Cycle

    Classroom Activities: Factors That Affect the Mosquito Life Cycle

    Activity

    In this activity, students rear mosquitoes in chambers and test variables that might affect the life cycle of the mosquito.

  • Classroom Activities: The Mosquito Life Cycle

    Classroom Activities: The Mosquito Life Cycle

    Activity

    To accompany the lecture series Viral Outbreak: The Science of Emerging Disease.

  • The Mosquito Life Cycle

    The Mosquito Life Cycle

    Clip

    (1 min 7 sec) To prevent mosquitoes from spreading diseases, it's essential to understand their life cycle.

  • Symbiotic Bioluminescence

    Symbiotic Bioluminescence

    Click & Learn

    Explore the biology of the symbiotic relationship between the Hawaiian Bobtail squid and bioluminescent bacteria Vibrio fischeri.

  • Q&A on Cone Snails

    Q&A on Cone Snails

    Lecture

    (9 min 18 sec) In this ten-minute Q&A session, Dr. Olivera answers questions on cone snail behavior, venoms, and biodiversity.

  • From Venoms to Drugs

    From Venoms to Drugs

    Lecture

    (58 min 29 sec) Venomous carniverous cone snails are a rich source of molecules for scientific research and potential drug development.

  • Cone Snails: Versatile Hunters

    Cone Snails: Versatile Hunters

    Clip

    (13 min 39 sec) Dr. Jason Biggs of the University of Guam Marine Laboratory discusses the anatomy of cone snails and introduces us to a variety of cone snail species with different tactics to hunt and capture their prey.

  • Conus tulipa hunts fish by net

    Conus tulipa hunts fish by net

    Clip

    (1 min 7 sec) Unlike a hook-and-line type fish-hunter, a net-hunting cone snail lures its prey into its wide mouth.

  • Conus textile strikes a snail

    Conus textile strikes a snail

    Clip

    (44 sec) A snail-hunting species of cone snail stings its prey repeatedly, inducing the prey to thrash about.

  • Conus striatus strikes a fish

    Conus striatus strikes a fish

    Clip

    (44 sec) A species of fish-hunting cone snail quickly immobilizes its prey and swallows it.

  • Conus imperialis strikes a worm

    Conus imperialis strikes a worm

    Clip

    (31 sec) A worm-hunting cone snail species feeds on fireworms, and is unaffected by the prey's sharp bristles.

  • Conus catus strikes a fish

    Conus catus strikes a fish

    Clip

    (1 min 11 sec) A fish-hunting cone snail strikes its prey with a venomous harpoon, causes paralysis, and eats it.

  • Conus bullatus "lightning strike"

    Conus bullatus "lightning strike"

    Clip

    (1 min 10 sec) This species of cone snail immobilizes its prey in a split second with lightning-strike cabal toxins.

  • Bobtail squid swimming and burrowing

    Bobtail squid swimming and burrowing

    Clip

    (1 min 3 sec) The bobtail squid swims during the night to hunt. During the day, it burrows to hide from predators.

  • Classroom Activities: Mirror-Tracing Activity

    Classroom Activities: Mirror-Tracing Activity

    Activity

    To accompany the lecture series Making Your Mind: Molecules, Motion, and Memory.

  • Neural Control of Walking and Running

    Neural Control of Walking and Running

    Click & Learn

    Different gaits employed by animals and how the nervous system is able to switch between them. Also available in Spanish.

  • Memories are Made of This

    Memories are Made of This

    Lecture

    (58 min 29 sec) The cellular and molecular nature of learning and memory, investigated in simpler sea slugs and more-complex mice. Molecular basis of Alzheimer's disease.

  • Plan of Action: How the Spinal Cord Controls Movement

    Plan of Action: How the Spinal Cord Controls Movement

    Lecture

    (58 min 29 sec) Understanding the neural circuits in the spinal cord that control movement.

  • Mapping Memory in the Brain

    Mapping Memory in the Brain

    Lecture

    (58 min 29 sec) The history of localization of function in the brain, and research that led to the understanding of localization of memory.

  • Making Your Mind: Molecules, Motion, and Memory

    Making Your Mind: Molecules, Motion, and Memory

    Lecture

    What is mind? Can molecular biology help us understand mental function?

  • Clive Wearing: A man without memory

    Clive Wearing: A man without memory

    Clip

    Clive Wearing has lost his ability to remember and lives in a perpetual state of having just awoken.

  • Waterman touching thumb to fingers without feedback

    Waterman touching thumb to fingers without feedback

    Clip

    (1 min 15 sec) In the absence of proprioception and visual feedback, it is impossible to touch thumb to fingers accurately.

  • Walking versus hopping

    Walking versus hopping

    Clip

    (1 min 12 sec) In a giraffe's walk, left and right limbs move alternately, while in a kangaroo's hop, opposing limbs move together.

  • Visualizing learning

    Visualizing learning

    Clip

    (5 min 39 sec) Dr. Harshad Vishwasrao guides you through a collection of images showing neuronal growth and synaptic formation representative of anatomical changes that occur during learning.

  • Demo: Using spatial memory to clear an obstacle

    Demo: Using spatial memory to clear an obstacle

    Clip

    (2 min 9 sec) Even without visual feedback, we are able to negotiate an obstacle using spatial memory.

  • Behavior of mice that lack proprioception

    Behavior of mice that lack proprioception

    Clip

    (24 sec) Genetically engineered mice lacking proprioceptive sensory axons are not capable of well-coordinated walking.

  • Demo: Proprioception makes raising a mug easy

    Demo: Proprioception makes raising a mug easy

    Clip

    (52 sec) The average person has no difficulty raising a coffee mug.

  • Mutant mice with crossed excitation hop

    Mutant mice with crossed excitation hop

    Clip

    (1 min 18 sec) Kangaroo-like hopping when spinal cord excitatory interneurons cross the midline to stimulate both sides.

  • Mice navigate a Barnes maze to test spatial learning

    Mice navigate a Barnes maze to test spatial learning

    Clip

    (2 min 15 sec) Mice can be trained to use spatial cues to navigate a maze that tests their ability to remember specific locations.

  • Muscle activity during walking and hopping

    Muscle activity during walking and hopping

    Clip

    (45 sec) Electrical activity recorded from the leg muscles reveals different patterns of activation during different gaits.

  • Ian Waterman: Compensating for proprioceptive loss

    Ian Waterman: Compensating for proprioceptive loss

    Clip

    (1 min 41 sec) In the absence of proprioceptive feedback, some individuals can compensate by using visual feedback.

  • Computer analysis of human movement

    Computer analysis of human movement

    Clip

    (56 sec) Dr. Jessell's leg muscle activation patterns are recorded during walking.

  • Cat remembers obstacle location for many minutes

    Cat remembers obstacle location for many minutes

    Clip

    (1 min 38 sec) Even when distracted by food, the cat's brain encodes and retains the location of an obstacle.

  • Aplysia's gill-withdrawal reflex and sensitization

    Aplysia's gill-withdrawal reflex and sensitization

    Clip

    (1 min 25 sec) A touch to the Aplysia's siphon causes a gill withdrawal, a simple reflex for studying memory.

  • Neurons in parietal cortex are active during straddling

    Neurons in parietal cortex are active during straddling

    Animation

    (1 min 4 sec) Neurons in the cortical area 5 are active when a cat is straddling an obstacle.

  • Classroom Activities: Drug Adherence Activity

    Classroom Activities: Drug Adherence Activity

    Activity

    To accompany the lecture series AIDS: Evolution of an Epidemic. In this activity, you simulate taking HIV antiretroviral drugs by using tic tac mints and Kool-Aid packets.

  • Classroom Activities: Planaria Regeneration Activity

    Classroom Activities: Planaria Regeneration Activity

    Activity

    This activity uses the planaria's property for regeneration and compares how long it takes for planaria cut in different places to regenerate a head. 

  • Fruit Fly Courtship

    Fruit Fly Courtship

    Clip

    (55 sec) Male courtship dances in two fruit fly species show that the wing spots play a prominent role.

  • Understanding Fat: Syndrome X and Beyond

    Understanding Fat: Syndrome X and Beyond

    Lecture

    (58 min 29 sec) Dr. Evans describes how fat communicates with muscle and how diet and exercise influence that relationship.

  • Deconstructing Obesity

    Deconstructing Obesity

    Lecture

    (58 min 20 sec) Dr. Friedman introduces the genes and circuits that control appetite, including the key role of leptin.

  • The Science of Fat

    The Science of Fat

    Lecture

    In the 2004 Holiday Lectures on Science, HHMI investigators Ronald M. Evans and Jeffrey M. Friedman discuss how the body regulates weight by carefully controlling the storage and burning of fat—and how a better understanding of these complex metabolic systems could lead researchers to treatments that curb obesity and improve public health. Awards 2006 Telly Awards; Silver

  • Marathon Mouse

    Marathon Mouse

    Clip

    (53 sec) Dr. Ronald Evans discusses the so-called "marathon" mouse, with a mutation in the PPAR-gamma gene, and its performance on a treadmill relative to a normal mouse.

  • Mouse Activity

    Mouse Activity

    Clip

    (30 sec) Dr. Evans compares the activity of a normal mouse to one with a mutation in a key gene controlling obesity.

  • Leptin Feedback Control System

    Leptin Feedback Control System

    Animation

    (1 min 1 sec) Demonstrates how changes in the amount of fat tissue lead to changes in leptin levels and thus changes in appetite.

  • SCA1 Mouse on Rotarod

    SCA1 Mouse on Rotarod

    Clip

    (35 sec) Dr. Zoghbi demonstrates how mice that have been given the gene responsible for spinocerebellar ataxia 1 (SCA1) are tested on a device called a rotarod to quantify the amount of ataxia present.

  • Rett Syndrome

    Rett Syndrome

    Clip

    (2 min 52 sec) Dr. Zoghbi introduces the topic of Rett syndrome by showing how development usually progresses in a young girl. She then shows an excerpt from Silent Angels, introduced by Julia Roberts, which shows how Rett syndrome affects development.

  • Rett Syndrome Mouse

    Rett Syndrome Mouse

    Clip

    (1 min 14 sec) Dr. Zoghbi shows how a mouse that has been given the gene responsible for Rett syndrome exhibits some of the same neurological symptoms as human Rett patients.

  • C. elegans Mating

    C. elegans Mating

    Clip

    (57 sec) Video microscopy of mating between a male and a hermaphrodite C. elegans roundworm.

  • From Fertilization to Egg Laying in C. elegans

    From Fertilization to Egg Laying in C. elegans

    Clip

    (1 min 12 sec) Video of the fertilization of the C. elegans oocyte, the fusion of the egg and sperm nuclei, and the egg laying.

  • Teacher Guide: Holiday Lectures on Science - 2000

    Teacher Guide: Holiday Lectures on Science - 2000

    Teacher Guide

    A guide written for teachers to accompany the 2000 Holiday Lectures on Science.

  • Are You a Morning or an Evening Person?

    Are You a Morning or an Evening Person?

    Click & Learn

    This survey, developed by Horne and Ostberg, will let you determine if you are a morning or an evening person.

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