A group of 14 stink bug eggs attached to the underside of a poplar leaf.
Many animals have a third eyelid called a nictitating membrane that protects the eye.
The young starlet sea anemone forms tentacles by cell division, migration, and shape changes.
... but that's not all they'll do. Several genes determine the diverse shapes and functions of crustacean appendages.
Female peacock spiders stay with their young in an egg sac until they can fend for themselves.
Chromosomes change form as a cell divides to ensure that each daughter cell gets a full, intact copy of the genome.
The male peacock spider performs a spectacular dance to attract a mate—but the female is not always impressed.
Zebrafish blood is generated from stem cells located in the tail region of fish embryos and later from stem cells located in the kidney of the adult fish.
Two views of a late pupa of an unidentified midge species (family Chironomidae).
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.