A unique feature is their ability to feed by suction, depressing either the left side of their lower jaw or the right.
ɐ juːnˈiːk fˈiːtʃɚɹ ɪz ðɛɹ ɐbˈɪləɾi tə fˈiːd baɪ sˈʌkʃən, dᵻpɹˈɛsɪŋ ˈiːðɚ ðə lˈɛft sˈaɪd ʌv ðɛɹ lˈoʊɚ dʒˈɔː ɔːɹ ðə ɹˈaɪt.