House wrens spend the summer in Decorah. They eat almost exclusively insects and spiders, including beetles, caterpillars, earwigs, daddy longlegs, flies, leafhoppers, and springtails: an insectivorous diet that requires them to fly south for the winter.
House wrens nest in cavities. They build a pile of twigs in which to create a shallow depression, which they line with feathers, grasses, hair, spider egg sacs, string, snakeskin, and discarded plastic. They lay three to ten eggs per clutch and produce up to two broods per year. House wrens incubate eggs for 9-16 days and young stay in the nest for 15-17 days before fledging. To learn more, visit Cornell’s website.