Its wingspan ranges from 62 to 94 cm (24 to 37 in).[1][4] Individuals living in the eastern regions, where the sexes average 349 g (12.3 oz) and 566 g (20.0 oz), tend to be larger and heavier than those in the western regions, where the respective sexes average 280 g (9.9 oz) and 440 g (16 oz).[5]