A crow is seen using its beak to preen its partner’s head feathers while sitting on a branch together in southwest Switzerland on June 6, 2018. Feather preening
A crow is seen using its beak to preen its partner’s head feathers while sitting on a branch together in southwest Switzerland on June 6, 2018. Feather preening is a way for birds to court a mate and to communicate between members. (Video: VCG)