Longest bird's nest burrow

The longest nest burrows on record for any species of bird are those for the rhinoceros auklet (Cerorhinca monocerata), a puffin-related seabird. Nesting on small grass-covered islands in the North Pacific, its nesting burrows typically measure 2–3 m (6.5–10 ft) long, but examples twice this long are not unusual, and one exceptional burrow measured 8 m (26 ft).