Microscopic plants and animals.

Tail feathers that are used in flight.

Animals that need special protection because they are vulnerable to environmental threats but they do not warrant an endangered or threatened status. This category would also be applied to animals tha [..]

The posterior opening that serves as the only opening for the intestinal, reproductive, and urinary tract of certain animals such as birds, reptiles, and amphibians.

A

Inviable. An egg that contains a dead embryo.

A birds nest. Raptor nests are most commonly referred to as an aerie.

Born in a relatively underdeveloped state as is the case of peregrine falcon chicks.

An animal belonging to the order (Amphipoda) of small crustaceans (such as a sand flea) having a thin, flattened body.

In snakes, a scale or plate just in front of the cloaca. The scale can either be single or paired.