sˈʌtʃ koʊˈɑːpɚɹətˌɪv bᵻhˈeɪvjɚz hæv sˈʌmtaɪmz bˌɪn sˈiːn æz ˈɑːɹɡjuːmənts fɔːɹ lˈɛftwˈɪŋ pˈɑːlətˌɪks, fɔːɹ ɛɡzˈæmpəl, baɪ ðə ɹˈʌʃən zuːˈɑːlədʒˌɪst ænd ˈænɑːɹkˌɪst pˈiːɾɚ kɹˈɑːpətkˌɪn ɪn hɪz nˈaɪntiːnhˈʌndɹɪd tˈuː bˈʊk mjˈuːtʃuːəl ˈeɪd: ɐ fˈæktɚɹ ʌv ˌɛvəlˈuːʃən ænd mˈɔːɹəl fɪlˈɑːsəfɚ pˈiːɾɚ sˈɪŋɚɹ ɪn hɪz bˈʊk ɐ dɑːɹwˈɪniən lˈɛft.
Such cooperative behaviors have sometimes been seen as arguments for left-wing politics, for example, by the Russian zoologist and anarchist Peter Kropotkin in his 1902 book Mutual Aid: A Factor of Evolution and Moral Philosopher Peter Singer in his book A Darwinian Left.