Wrens are tiny, yet active, energetic and inquisitive. Male and female have similar markings and are mainly a dark rufous-brown.
They are loud, noisy birds, but their melodic warbling song is enjoyed by many who put out Wren feeders to attract them to the yard. They are most likely to visit suet feeders.
Thank you to The Macaulay Library at the Cornell Lab of Orthinology, Ithaca, New York who provided the picture and audio.