They are not social during the day, but may roost together at night, especially during the winter. As many as ten have been found packed into a coconut shell, and 46 were counted in a single nest box. They fly rapidly and close to the ground. The wren has an incredibly loud voice for such a small bird. The song is a long, excited verse, with many trills and metallic ringing tones.
Wrens sing mostly from cover, and sound like no other British bird.
The cock builds a large domed nest, often in ivy, buildings or between rocks, and the female lines it with feathers. The female lays about 5-6 eggs which she incubates for about two weeks. When they hatch, it is the female that takes responsibility for feeding the chicks. The young can fly after about 16-17 days. Two broods a year are normal.