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  • Selection for Tuskless Elephants

    Selection for Tuskless Elephants

    Scientist at Work

    (6 min 39 sec) Working in Gorongosa National Park, Mozambique, Dr. Joyce Poole and colleagues make a striking observation: many female elephants lack tusks.

  • Understanding Variation

    Understanding Variation

    Activity

    This lesson complements the film The Biology of Skin Color and discusses variation in human skin color and polygenic inheritance.

  • Zebrafish and Skin Color

    Zebrafish and Skin Color

    Activity

    This lesson complements the film The Biology of Skin Color and explores how experimental work in zebrafish led to a better understanding of the gene SLC24A5, which plays a large role in the expression of lighter skin tones.

  • Dead Zones in Coastal Ecosystems

    Dead Zones in Coastal Ecosystems

    Data Point

    Researchers overlaid the locations of more than 400 hypoxic systems linked to eutrophication on a map of the global “human footprint.”

  • Exploring Trophic Cascades

    Exploring Trophic Cascades

    Click & Learn

    This interactive explores examples of what can happen when there are changes in the population size of one species in an ecosystem. How are species at other trophic levels affected? How does the ecosystem change?

  • Finding A Place On The Tree

    Finding A Place On The Tree

    Image of the Week

    Dendrogramma is a newly-discovered species of deep sea siphonophore.

  • Human Impacts on Biodiversity

    Human Impacts on Biodiversity

    Activity

    In this activity, students will use trail camera data to answer a scientific research question about the impacts of humans on species diversity in Gorongosa.

  • Biological Basis of a Myth

    Biological Basis of a Myth

    Image of the Week

    Hydra is a small freshwater hydrozoan polyp that has the capacity to grow a new individual from any part of its body.

  • Following the Matriarch

    Following the Matriarch

    Image of the Week

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

  • Zebrafish Brain Cells for Spontaneous Navigation

    Zebrafish Brain Cells for Spontaneous Navigation

    Image of the Week

    The brain and part of the spinal cord of a one-week-old zebrafish, showing neurons that are active during a left turn (green), a right turn (red), or when swimming straight ahead (blue)

  • Thermoregulation in Dinosaurs

    Thermoregulation in Dinosaurs

    Data Point

    Grady and colleagues compared dinosaur fossil evidence with evidence from living animal species to shed more light on the type of thermoregulation that dinosaurs used—ectothermy, endothermy, or mesothermy.

  • Discovering Keystone Species

    Discovering Keystone Species

    Poster

    This classroom poster illustrates Robert Paine’s pioneering experiment that demonstrated the importance of top-down regulation of ecological communities by predators and led to his coining of the term keystone species.

  • Film Guide for Some Animals are More Equal than Others

    Film Guide for Some Animals are More Equal than Others

    Film Guide

    The following classroom-ready resources complement the film Some Animals Are More Equal Than Others: Trophic Cascades and Keystone Species. It tells the story of the bold experiments by Robert Paine and James Estes, which established the importance of keystone species in regulating ecological communities and the cascades of effects set in motion by their removal.

  • Virus Explorer

    Virus Explorer

    Click & Learn

    Explore the similarities and differences of a variety of viruses by sorting them based on structure, genomic make-up, host range, transmission mechanism, and vaccine availability.

  • Virus Hunter: Monitoring Nipah Virus in Bat Populations

    Virus Hunter: Monitoring Nipah Virus in Bat Populations

    Scientist at Work

    (9 min 1 sec) In this video we follow scientists working in Bangladesh as they test fruit bat populations to determine whether they are infected with Nipah virus—a potentially deadly virus when passed on to humans.

  • 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. 

  • Alzheimer’s Disease: Piecing Together the Evidence

    Alzheimer’s Disease: Piecing Together the Evidence

    Click & Learn

    This interactive explores evidence from brain anatomy, tissue histology, and genetic studies to reveal possible targets for the treatment of Alzheimer’s disease.

  • Selective Breeding in Maize

    Selective Breeding in Maize

    Data Point

    Researchers performed the longest-running, controlled artificial selection experiment to study whether they could increase the protein concentration of maize (corn) by selective breeding.

  • Using Genetic Evidence to Identify Ivory Poaching Hotspots

    Using Genetic Evidence to Identify Ivory Poaching Hotspots

    Data Point

    A team of scientists analyzed the DNA from seized ivory to determine where the ivory from poached elephants came from.

  • In Memoriam: Bob Paine

    In Memoriam: Bob Paine

    Article

    Sean Carroll and Bob Paine on a film shoot in January 2016.

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