this house sparrow is unusually dark because it is melanistic. animals that have a genetic mutation called melanism overproduce dark pigments, leading to unusual appearances like that of this bird.
source: (x)
Tag: melanism
this house sparrow is unusually dark because it is melanistic. animals that have a genetic mutation called melanism overproduce dark pigments, leading to unusual appearances like that of this bird.
source: (x)
today's bird 