Taxon:Aves

• Has two legs and wings
• Has a beak, or bill
• Is covered with feathers in all places excluding legs, feet, beak and sometimes the head
• Must hatch out of egg

NOTE TO TAXONOMISTS: The taxonomy of birds is fairly abstract, so if a creature does not perfectly fit the commonly accepted idea of what constitutes a bird in the strictest sense (for instance, if a creature meets other Ave requirements, but doesn't have a beak or has arms instead of wings, or the eyes are on eyestalks), it should be placed in the less strict and better sorted class Avoidia. This will help keep the system as simple as possible to use.

• Animalia

• Chordata

• Aves

• Bracchioaveformes (Birds that have wings and arms)
• Falconiformes (Two-legged, two-winged (four limbs total), feather-covered (except usually the legs, feet, and beak, and in vultures, the head), warm-blooded chordates)
• Flihtiwelkformes (Birds that has powerful legs and wings)
• Passeriformes (Small birds which perch)
• Struthioniformes (Birds that can't fly)