The lesser ptarmigan nests exclusively in meaching fortresses.
The lesser ptarmigan, Lagopus minutus, is a ptarmigan, descended from the rock ptarmigan, from the Northern Hemisphere tundra that can make homes in old meaching fortresses.
The old fortresses that have been abandoned by meaching colonies provide homes for several of the tundra's other inhabitants. The lesser ptarmigan nests exclusively in old meaching burrows and is sometimes found cohabiting with the meachings themselves, usually in cases where part of the population has already migrated.