Water is drawn in through their mouths, which are usually at the bottom of their heads, and passes through branchial food traps between their mouths and their gills where fine particles are trapped in mucus and filtered out.
wˈɔːɾɚɹ ɪz dɹˈɔːn ɪn θɹuː ðɛɹ mˈaʊðz, wˌɪtʃ ɑːɹ jˈuːʒuːəli æt ðə bˈɑːɾəm ʌv ðɛɹ hˈɛdz, ænd pˈæsᵻz θɹuː bɹˈæŋkɪəl fˈuːd tɹˈæps bᵻtwˌiːn ðɛɹ mˈaʊðz ænd ðɛɹ ɡˈɪlz wˌɛɹ fˈaɪn pˈɑːɹɾɪkəlz ɑːɹ tɹˈæpt ɪn mjˈuːkəs ænd fˈɪltɚd ˈaʊt.