Wrens have been known to nest almost anywhere. Nearly any hole a wren can get into is an appropriate place to build – a flowerpot, a mailbox, a boot, an abandoned woodpecker hole, a basket, even a pair of pants on the clothesline.
Wrens will also readily use a man-made house. The hole opening on a wren house should be between 1 and 1-1/4 inches. The wren, one of our smaller birds, will have no trouble getting in a hole this size but starlings, house sparrows and predators won’t be able to enter.
House wrens feed almost entirely on insects. They will also occasionally visit a feeder which offers suet, peanut butter, cornbread and white bread crumbs.