Some females found to have evolved with bright plumage, which seems to protect against male aggression
They may zip around looking cute and sociable, but the world of hummingbirds is rife with aggression. Now it looks like some female hummingbirds have evolved to avoid this – by adopting the bright plumage of their male counterparts.
US researchers captured more than 400 white-necked Jacobin hummingbirds in Panama.