Ruddy treerunner

The ruddy treerunner (Margarornis rubiginosus) is a passerine bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Costa Rica and Panama.

The ruddy treerunner is 15 to 16 cm (5.9 to 6.3 in) long and weighs 17 to 24 g (0.60 to 0.85 oz). The sexes have the same plumage. Adults of the nominate subspecies have a buffy whitish supercilium and eyering on an otherwise dull rufescent brown face. Their crown is dull reddish brown and they have a narrow, paler reddish, collar. Their upperparts and wing coverts are reddish chestnut. Their flight feathers are dark fuscous with rufescent edges. Their tail is a slightly paler reddish chestnut than the back; the ends of the tail feathers lack barbs, giving a spiny appearance. Their throat is whitish with a buffy white lower edge. Their breast is dull rufescent brown with pale buff "Vees" on its upper part and darker buff spots on the lower. Their belly is almost unmarked dull rufescent brown and their flanks and undertail coverts are a darker chestnut brown. Their iris is dark brown to brown, their maxilla brown to black, their mandible pinkish horn to pale pinkish white, and their legs and feet variable from grayish olive to dull pinkish to grayish brown. Juveniles have less distinct markings on their breast than adults. Subspecies M. r. boultoni has a deeper buff supercilium than the nominate, with slightly darker upperparts and deeper, richer, cinnamon underparts with smaller and fewer markings.