common crane (Grus grus)
A large migratory bird. The Japanese name literally means 'black crane', but the species is actually grey with a black-and-white head and neck.
くろづるはヨーロッパやアジアで見られる大型の鳥です。
The common crane is a large bird seen in Europe and Asia.
Compound of 黒 (くろ, 'black') + 鶴 (つる, 'crane'), with rendaku voicing. The name refers to the bird's dark plumage, though the species is not entirely black.