Kingbird nest and four eggs in the fork of a tree.

Avocet nest and four eggs.

A mallard duck nest and eggs in the corner of a rail fence.

A pintail nest with seven eggs in the corral.

A pintail duck egg, partially developed embryo, and recently hatched chick lined up to illustrate the progression of development.

A black tern nest with three eggs.

Close view of a pelican chick just emerging from its shell. William L. Finley visible in the background.

A black tern nest with three eggs.

A black tern nest with three eggs. Image note: large.

Cactus wren nest showing four eggs. Nest is partially torn away from cactus.