Scientific name: Uria aalge
The chocolate-brown guillemot nests in noisy, tightly packed colonies on perilous clifftops and rocky islands in northern UK. As a result, its territory is so small that it extends only a beak's-length around its nest.
Average lifespan: 23 years
Classified in the UK as Amber under the Birds of Conservation Concern 4: the Red List for Birds (2015).