Brown Goshawk

The brown goshawk is a medium-sized bird of prey in the family Accipitridae, formerly placed in the genus Accipiter. The upperparts are grey with a chestnut collar and the underparts mainly rufous, finely barred with white. It has similar colouring to the collared sparrowhawk but is larger, and the flight is fast and flexible. The body length is 40–55 cm and the wingspan 75–95 cm, with females noticeably larger than males (Wikipedia, general species account).

The cached account is centred on Australia and surrounding islands, so its occurrence on Sumatra is not detailed here.