Southern Bentbill

The southern bentbill is about 9 cm (3.5 in) long and weighs about 6 to 7 g (0.21 to 0.25 oz). It has a distinctive fairly thick downcurved bill. The sexes have the same plumage. Adults have a mostly olive head with a whitish area above the lores. Their back, rump, and uppertail coverts are olive. Their wings are dusky with lemon yellow edges on the flight feathers and greenish yellow tips on the coverts; the latter show as two indistinct wing bars. Their tail is dusky olive. Voice: The southern bentbill's call is a "uttural insect-like or toad-like trill, 'grrrrrrr' " that sometimes begins with a short note yielding "pt-trrrrrrrr". Another author says that a "oft mechanical errreet heard often".