Feathers
BIOLOGY
Not too different from humans, but they have ear and tail feathers. However, there is a large gap between the sexes, as the males tend to be more intelligent whereas the females are stronger and larger.
SOCIETY
It is more proper to conceal your feathers as they are seen as phallic due to their use for mating. It is also more common in earlier times for males to silence the females with their smarts, but in some rare instances females overpower the males with their strength.