Ruddy treerunner

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Ruddy treerunner
Margarornis rubiginosus.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Furnariidae
Genus: Margarornis
Species: M. rubiginosus
Binomial name
Margarornis rubiginosus
Lawrence, 1865

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.


  • ^ Daniel J. Mennill and Stéphanie M. Doucet, First description of the nest and eggs of the ruddy treerunner (Margarornis rubiginosus)) Cotinga 24 (2005): 109—110
  • Stiles and Skutch, A guide to the birds of Costa Rica ISBN 0-8014-9600-4