They mostly have four limbs, but some aquatic mammals have no limbs or limbs modified into fins, and the forelimbs of bats are modified into wings.
ðeɪ mˈoʊstli hæv fˈoːɹ lˈɪmz, bˌʌt sˌʌm əkwˈæɾɪk mˈæməlz hæv nˈoʊ lˈɪmz ɔːɹ lˈɪmz mˈɑːdᵻfˌaɪd ˌɪntʊ fˈɪnz, ænd ðə fˈɔːɹlɪmz ʌv bˈæts ɑːɹ mˈɑːdᵻfˌaɪd ˌɪntʊ wˈɪŋz.