rule 34 accipitrid accipitriform avian beak beak growth bird black hair brown body brown feathers buteo chickenhawk claw growth claws eyewear feather growth feathered wings feathers feral flaccid genitals glasses grey background growth hair hi res human human to feral jagal leaping male mammal nipples nude open mouth open smile overweight overweight human overweight male penis red tailed hawk running scutes sequence shaded short hair signature simple background smile solo species transformation spread wings tail feathers talons toe claws transformation transformation sequence wings 6356455