Timberline Wren

The timberline wren (Thryorchilus browni) is a species of bird in the family Troglodytidae. It is found in Costa Rica and western Panama. == Taxonomy and systematics == The timberline wren is the only member of genus Thryorchilus, but its taxonomy at the subspecies level is unsettled. The International Ornithological Committee (IOC) considers it to be monotypic. The Cornell Lab of Ornithology's Birds of the World lists three subspecies, but notes that this treatment is disputed and that timberline wren should be "perhaps better considered monotypic." The Clements taxonomy and the Handbook of Birds of the World list the same three subspecies without comment. The three disputed subspecies are the nominate Thryorchilus browni browni, T. b. ridgwayi, and T. b. basultoi. == Description == The timberline wren is 10 cm (3.9 in) long and weighs 14 g (0.49 oz). The adult of the nominate subspecies has rich chestnut brown crown and upperparts and a reddish brown tail with thin dark bars. It has a broad gray-white supercilium, a chocolate brown stripe behind the eye, and grayish cheeks with narrow black markings. Its throat and chest are grayish white, its upper belly a mottled grayish white, its lower belly brown, and…