A gull.

UK noun countable literary

the mouth of a fierce (= frightening) animal   （凶猛动物的）口部，嘴巴 the lion's maw   狮子的嘴

something that seems to surround and absorb everything near it    无底洞，深渊 She fears that the matter will simply be swallowed up by the maw of bureaucracy.   她害怕这件事只会被官僚体制的无底洞所吞没。