The ruddy treerunner (Margarornis rubiginosus), is a passerine bird which is endemic to the highlands of Costa Rica and western Panama.

This treerunner is found in hills and mountains from 1200 m up to the timberline, in forests and adjacent edges and clearings. It builds a large enclosed oval nest 25 m high in the crown of a tree on the underside of a thick branch. The nest is camouflaged with mosses and epiphytes and has a downward pointing entrance tunnel at its base[1]. The eggs are undescribed, but members of this family typically lay two white eggs.

The adult ruddy treerunner is 16 cm long, weighs 18 g and looks like a small, short-billed woodcreeper, but has soft, rather than rigid, tail spines. It has bright rufous upperparts and a white supercilium. It has a white throat and otherwise tawny underparts. Young birds are almost identical to the adults. The call is a sharp tsit, and the song is a twittering trill.

The ruddy treerunner forages for large insects, spiders and their eggs and larvae in mosses, plant debris, bromeliads and other epiphytes. It creeps along branches and up stems - but uses its tail for support less than a woodcreeper does. It is seen alone, in pairs, or as part of a mixed-species feeding flock.
Ruddy Treerunner
Date Location Count
2020-07-08 06:42NP Juan Castro Blanco--Albergue Pozo Verde2
2020-07-31 10:15Camino a la estación San Gerardo.2
2020-07-07 08:15Reserva Santa Elena1
2020-07-13 14:40Estación Biológica Monteverde3
2020-07-12 08:43Monteverde--Cloud Forest Reserve2
2020-07-25 08:15Monteverde Cloud Forest Reserve--Entrance1
2020-07-17 06:10Road Bajos del Volcan1
2020-07-27 10:25Reserva Natural Catarata de la Danta1
2020-07-27 06:38Monserrat de Coronado2
2020-07-11 19:52Iyok Ami2
2020-07-21 09:20PN Los Quetzales--KM 76, Providencia road3
2020-07-11 14:20San Gerardo de Dota2
2020-07-27 20:20Savegre Hotel4
2020-07-08 07:49camino a Santa Eduviges1
2020-07-27 09:22PN La Amistad--Altamira1