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.
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.