Intermediate in size are the hawks of Santiago Island, on which males weigh an average of 963 g (2.123 lb) while females average 1,295 g (2.855 lb). Largest known are the hawks on Española Island, which are amongst the largest Buteo known anywhere, with males averaging 1,137 g (2.507 lb) and females averaging 1,578 g (3.479 lb).[3] The adult hawk has various colouring within the species. The adult Galapagos hawk is generally a sooty brownish black colour; the crown being slightly blacker than the back.