Kusan dukkan dabbobi suna amfani da wasu nau'ikan haifuwa ta hanyar jima'i. Suna samar da gametes na haploid ta hanyar meiosis; ƙananan, masu motsi masu motsi sune spermatozoa kuma mafi girma, gametes marasa motsi sune qwai. Wadannan suna haɗuwa don samar da zygotes, wanda ke bunkasa ta hanyar mitosis a cikin wani wuri mai banƙyama, wanda ake kira blastula. A cikin sponges, larvae na blastula suna iyo zuwa sabon wuri, suna haɗe da seabed, kuma suna bunkasa cikin sabon soso. A mafi yawan sauran kungiyoyi, blastula yana fama da rikitarwa mai rikitarwa.
haifuwa ta hanyar jima'i