"Bird nest" is the Engpsh translation for "鸟窝". The word "nest" comes from Old Engpsh "nest", which is related to the Germanic word "nest" and the Proto-Indo-European root "néstos" meaning "home".
Here are some example sentences and their translations:
The bird built its nest in the tree. (鸟在树上建了它的窝。)
The eagle's nest was high up in the mountains. (老鹰的窝高高地在山上。)
The baby birds were born in the nest. (小鸟在窝里出生。)