A touch to the Aplysia's siphon causes a gill withdrawal, a simple reflex for studying memory.
The bobtail squid swims during the night to hunt. During the day, it burrows to hide from predators.
Video microscopy of mating between a male and a hermaphrodite C. elegans roundworm.
Even when distracted by food, the cat's brain encodes and retains the location of an obstacle.
Chimpanzees are capable of using rocks as tools to crack nuts for eating. But they don't appear to use sharp-edged tools.
Dr. Jessell's leg muscle activation patterns are recorded during walking.
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.
This species of cone snail immobilizes its prey in a split second with lightning-strike cabal toxins.
A fish-hunting cone snail strikes its prey with a venomous harpoon, causes paralysis, and eats it.
A worm-hunting cone snail species feeds on fireworms, and is unaffected by the prey's sharp bristles.
A species of fish-hunting cone snail quickly immobilizes its prey and swallows it.
Larger cone snails produce more venom and are more dangerous to human beings in an accidental stinging.
Fossilized dung beetle balls are part of a comprehensive fossil collection project to reconstruct the habitat of Ardipithecus ramidus.
Male courtship dances in two fruit fly species show that the wing spots play a prominent role.
HHMI investigator Jeff Friedman provides an update to his 2004 lectures on obesity.
This time-lapse videoclip shows human circadian activity while assembling a T. rex skeleton.
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.
Mice can be trained to use spatial cues to navigate a maze that tests their ability to remember specific locations.
Dr. Evans compares the activity of a normal mouse to one with a mutation in a key gene controlling obesity.
This time-lapse videoclip illustrates a mouse's nocturnal behavior.
Dr. Zoghbi introduces the topic of Rett syndrome by showing how development usually progresses in a young girl. She then shows an excerpt from ...
At the end of the ice age, the retreating ice sheet created many new lakes, some of which were colonized by sticklebacks.
To prevent mosquitoes from spreading diseases, it's essential to understand their life cycle.
Dr. Harshad Vishwasrao guides you through a collection of images showing neuronal growth and synaptic formation representative of anatomical changes that occur during learning.