Related words どんぐりの 背せい 比くら べ Means 'they are all alike; there is little difference among them,' often with a slightly negative nuance, while 蝙蝠も鳥のうち emphasizes inclusion despite differences.
五ご 十じっ 歩ぽ 百ひゃっ 歩ぽ Means 'six of one, half a dozen of the other; there is not much difference,' focusing on similarity of faults or situations, whereas 蝙蝠も鳥のうち is about belonging to the same group.
Written forms 蝙蝠こうもり も 鳥とり のうち
Standard kanji form of the proverb.
蝙蝠こうもり も 鳥とり の 内うち
Variant kanji spelling using 内 instead of うち .
こうもりも 鳥とり のうち
Mixed kana-kanji spelling, sometimes seen in less formal contexts.
Etymology A traditional Japanese proverb. The literal meaning is 'even bats are among birds,' referring to the fact that bats, though they fly like birds, are mammals. The phrase is used figuratively to express that everyone, regardless of differences, belongs to the same group or shares the same circumstances.
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