Storm petrels normally nest in crevices between or under rocks, or burrow in the soil. When they make their own tunnels, they loosen the earth with their bills and kick out the debris with their feet. The birds less commonly nest in walls, under buildings, or down rabbit burrows. Disused or occupied burrows of Atlantic puffins and Manx shearwaters are sometimes used, and the petrel pair may share a common entrance with those seabirds, rabbits, or other pairs of its own species. Where other occupants are present, the petrels dig a side burrow or use an existing low-roofed tunnel which the larger birds or rabbits cannot easily enter. Even so, puffins and shearwaters sometimes access and destroy nests, and adult petrels may be killed by their larger neighbours. Human-made plastic nesting tubes are readily used, and may provide protection against predators. Birds usually mate for life and use the same hole every year.