{"fact":"Crows have low variability in plumage coloration, voice, size and shape, which is unusual considering the diversity of habitats they inhabit.","context":"Crows, rooks and ravens (Corvidae, genus Corvus subgenus Corvus) display extremely low levels of variability in plumage colouration, voice, size and shape, an unusual conservatism given that crows inhabit all habitats and latitudes, including the harshest extremes on earth (Madge and Burn 1984).","source":"Paola Laiolo, Phenotypic similarity in sympatric crow species: Evidence of social convergence?, 10.1111/evo.13195","index":627}