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nest; rookery; breeding place; hive
den
haunt
(spider's) web
木の上に鳥の栖が見つかった。
A bird's nest was found up in the tree.
蜂の栖には近づかない方がいいだろう。
It's probably best not to go near the beehive.
ツバメが軒先に栖を作り始めている。
Swallows have started building nests under the eaves.