Natural History Wrens begin nesting from March through August and can raise two broods in one season.
Male wrens build many nests, sometimes as many as five or six, for their intended mates.
Biologists think this may be the male wren's strategy for keeping other birds from nesting in his territory. Wrens are protected by law and may not be taken or harassed and their nests may not be destroyed. Wrens lay four to nine eggs which hatch in about two and a half weeks. The young leave the nest about two weeks later. Kinds of Wrens House wrens are Maryland's most common wren species and the one most likely to nest in a backyard nest box.