expression, godan verb (-bu)
birds of a feather flock together
Proverb meaning that people with similar tastes, characters, or interests naturally gather together.
彼らはすぐに仲良くなった。類は友を呼ぶというからね。
They quickly became friends. Birds of a feather flock together, as they say.
A Japanese proverb of uncertain origin, literally meaning 'like calls to like' or 'similar kinds call their friends'.