All moray eels have 'pharyngeal jaws,' a second set of mandibles nestled in their throat. The eels bite their prey with their primary 'oral' jaws, then suck it down their gullets with their interior pharyngeal jaws, which pop out briefly. The eerie action has drawn comparisons to the terrifying secondary mouth of the Xenomorph from the Aliens movie franchise. In a study published this week in The Journal of Experimental Biology, researchers explained how the snowflake moray uses its pharyngeal jaws to feed on dry land.