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Internal Organs
Fast, efficient GI tract, high metabolic rate, double circulation with 4 chambered heart
Senses
Endothermic, no urinary bladder (excrete uric acid), well developed brain, acute vision and hearing
Reproduction
Internal fertilization; elaborate mating rituals; eggs are brooded
Precocial
Born covered with down; active immediately; can run and swim when dry (quail, duck geese)
Altricial
Born naked and helpless; in nest for >1 week; require extended parental care (songbirds. raptors, penguins)