An interesting example of altruism is found in the cellular slime moulds, such as Dictyostelium mucoroides.
ɐn ˈɪntɹɛstɪŋ ɛɡzˈæmpəl ʌv ˈɔːltɹuːˌɪzəm ɪz fˈaʊnd ɪnðə sˈɛljʊlɚ slˈaɪm mˈoʊldz, sˈʌtʃ ɐz dˌɪktɪəstˈiːliəm mjˈuːkoːɹˌɔɪdz.