Whistling Kite

The whistling kite ranges in size from 50 to 60 cm (20 to 24 in), with a wingspan between 123 and 146 cm (4 ft 0 in and 4 ft 9 in). Weights range from 380 to 1,050 g (0.84 to 2.31 lb) an average of 600 to 750 g (1.32 to 1.65 lb) for males and 750 to 1,000 g (1.65 to 2.20 lb) for females. As with most raptors, females are larger and heavier than males; though there is considerable overlap between the sexes, females can be up to 21% larger and 42% heavier. Southern birds are also larger than those found in the tropics. Male and female plumages are the same. Voice: This is a noisy species, calling regularly in flight and while perched—even while at the nest. Its most common call is a clear descending whistle, often followed (less often preceded) by a rapid series of rising notes.