Sponges feed themselves through chambers of specialized cells.
The golden birdwing provided a striking clue to the natural origin of species.
The eye of a chimpanzee views the world in living color.
The young starlet sea anemone forms tentacles by cell division, migration, and shape changes.
The fins of the scalyhead sculpin are related to our arms.
Tiktaalik roseae, also known as the “fishapod,” is an animal that lived about 375 million years ago, with features of fish and four-legged animals.
The Cape Cliff lizard sports a bony body armor.
The shape of our hands comes from tree-dwelling ancestors.
... but that's not all they'll do. Several genes determine the diverse shapes and functions of crustacean appendages.
Infant lemurs hitch a ride through the forest by holding on to their mother’s tummy or riding piggyback.
The bill of the buff-tailed sicklebill hummingbird is perfectly shaped to collect nectar from deep within the Centropogon flower.
Reef-building corals depend on brown-colored symbiotic algae for survival.
This short-tailed fruit bat embryo shows a pattern of bones in its limbs characteristic of all tetrapods: one bone, two bones, lots of bones, digits.
During the larval stage, the Nemertean worm develops inside a hollow sac from which the juvenile eventually emerges, rupturing the sac and then eating the remains.
A reconstruction of Anchiornis huxleyi, a feathered dinosaur that is part of the ancestral lineage of birds.
The Plymouth anole (Anolis lividus) lizard is found only on the Caribbean island of Montserrat—and it is the only anole species living there.
As a student of divinity at Cambridge University, Charles Darwin was an enthusiastic collector of beetles
A tree scorpion illuminated with UV light gives off a blue-green glow.
Pikas are small mammals related to rabbits that can only live in cold climates, either at high latitude or high elevations in North America and Asia.