Mouse-colored thistletail

The mouse-colored thistletail (Asthenes griseomurina) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Ecuador and Peru.

The mouse-colored thistletail is 18 to 21 cm (7.1 to 8.3 in) long and weighs 15.5 to 19 g (0.55 to 0.67 oz). The sexes have the same plumage. Adults have a faint light gray-brown supercilium and a white eyering on an otherwise gray face. Their crown, back, rump, wings, and tail are dull olive-brown. Their tail is long and deeply forked with few barbs at the feather ends that give a ragged appearance. Their throat is pale gray or grayish brown (often with faint white streaks on the chin) and the rest of their underparts are pale grayish brown. Their iris is brown, their maxilla dark gray, their mandible paler but variable, and their legs and feet blue-gray.