a bird of prey; a raptor, especially an eagle

(literary) malicious and treacherous; sinister and ruthless

fierce and tough like a bird of prey; ferocious

a bird that hunts and feeds on other animals; specifically any bird with a fierce temperament such as an eagle or hawk

Literally meaning that birds of prey do not flock with ordinary birds; used to describe a person of integrity and strong character who refuses to follow the crowd or associate with the corrupt.