Large mouths that can open wide
Fast
Raptorial, syndactyl, or zygodactyl
Small bodied
Long strong beaks
Strong beaks
Raptorial or zygodactyl
Hooked wings
Able to filter seawater
Palmate, totipalmate, or lobate feet
Quiet feathers
Oiled feathers
Anisodactyl
Long tongue
Extensible gular pouch
Long split tongue
Long skinny beaks
Pamprodactyl or anisodactyl feet
Bald heads
Only come to land to nest/mate
Hooked beak
Specialized beak
Pointed beaks
Beak that crosses over
Zygodactyl feet
Stiff tail feathers
Pointed angular beak
Sharp talons or claws to hold onto slippery prey
Have a light-colored under-belly
Good sense of smell
Broad beaks
Strong sharp talons or claws to tear or hold prey
Have dark-colored under-belly
Palmate, semipalmate, totipalmate, syndactyl, or raptorial feet
Ansiopalmate
Anisodactyl, semipalmate, or zygodactyl feet
Short, pointed beaks
Have shiny structural feathers
Variety of foot types
