Birds of a feather flock together

Meaning: People with similar interests or characteristics tend to associate with each other.

Example: “The three chess fanatics found each other within an hour; birds of a feather flock together.”

Origin: The first known English appearance is in William Turner's pamphlet The Rescuing of the Romish Fox (1545), which says that birds of one kind and color flock and fly together. The thought goes back further, to Ecclesiasticus 27:9: "The birds will resort unto their like." "Of a feather" means of the same plumage, and so of the same kind.

Equivalents in French, Spanish, Japanese, German, Italian, and 7 more languages

French: Qui se ressemble s'assemble (literally: Those who resemble each other gather together)
Spanish: Dios los cría y ellos se juntan (literally: God raises them and they come together)
Japanese: 類は友を呼ぶ (Rui wa tomo o yobu) (literally: Like calls to like)
German: Gleich und gleich gesellt sich gern (literally: Like and like gladly keep company)
Italian: Chi si somiglia si piglia (literally: Those who are alike take to each other)
Portuguese: Cada qual com o seu igual (literally: Each one with his equal)
Dutch: Soort zoekt soort (literally: Kind seeks kind)
Russian: Рыбак рыбака видит издалека (Rybak rybaka vidit izdaleka) (literally: A fisherman spots a fisherman from afar)
Polish: Ciągnie swój do swego (literally: One's own draws to one's own)
Chinese: 物以类聚 (Wù yǐ lèi jù) (literally: Things gather by kind)
Korean: 가재는 게 편 (Gajaeneun ge pyeon) (literally: The crayfish sides with the crab)
Arabic: الطيور على أشكالها تقع (Aṭ-ṭuyūr ʿalā ashkālihā taqaʿ) (literally: Birds land with their own kind)