Other forms: wrens
That tiny brown bird you see flitting past your window may be a wren, especially if it's got a tiny, upright tail.
Wrens are busy little brown birds, mostly found in North and South America. Often wrens are tiny and inconspicuous, with small wings and stubby little tails, although their songs can be quite noisy and complex. The origin of the word wren isn't known beyond the fact that it was wrenna in Old English, from a Germanic root.