"The true wrens are members of a New World passerine bird family Troglodytidae containing 55 species".
A troglodyte means a cave-dweller, and wrens get their scientific name from the tendency of some species to forage in dark crevices. They are mainly small and inconspicuous except for their loud songs. These birds have short wings and a thin down-turned bill. Several species often hold their tails upright. All are insectivorous.
