Description wikipedia

The olivaceous piculet (Picumnus olivaceus) is a species of bird in subfamily Picumninae of the woodpecker family Picidae. It is found from Guatemala south through Central America and western South America to Peru. The olivaceous piculet is 8.5 to 10 cm (3.3 to 3.9 in) long and weighs 10 to 15 g (0.35 to 0.53 oz). Adult males of the nominate subspecies P. o. olivaceus have a black crown and nape with red tips on the feathers of the front and top and white spots on the rest. Their face is mostly brown with white feather tips. Their upperparts are olive-brown with a yellow tinge. Their flight feathers are dark brown with yellow to yellow-green edges. Their tail is brown; the innermost pair of feathers have pale buff or yellowish inner webs and the outer two pairs a pale buff or yellowish stripe. Their chin and throat are buff to yellowish white with a fine darker scaly appearance. Their underparts are yellowish brown on the breast becoming buffish white to dull yellowish on the belly; the belly and flanks have wide but variable brownish streaks. Their iris is dark brown, the beak black with a gray base to the mandible, the bare skin around the eye gray to blue-gray, and the legs gray with a green or blue tinge. Adult females are identical but with white spots on the whole crown and no red. Juveniles are duller and browner than adults and sometimes have paler and more heavily streaked underparts. The other subspecies have some differences from the nominate. P. o. dimotus has more of a greenish tinge to the upperparts, is paler and more olive below, and has yellow-orange tips on the crown feathers. P. o. flavotinctus has darker and more olive upperparts, more olive underparts, and yellow on the crown. P. o. eisenmanni has much yellower upperparts, a pale yellowish olive breast and yellow belly, and orange to yellow on the crown. P. o. tachirensis has green-tinged upperparts and orange to yellow on the crown. P. o. harterti is a darker olive overall with yellow to golden on the crown.