This eel-like creature is an anatomical anomaly. It's the only known living animal that lacks a backbone and jaw but still has a skull. Hagfish secrete a goo when attacked that expands when combined with water. The predator is then choked by the expanded goo.
Hagfish: The Jawless "Slime Eel"
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Key Facts In This Video
The hagfish is the only known living animal with a skull but no spine. 00:20
The hagfish does not have a jaw, but rather tooth-like projections. 00:42
The hagfish secretes a micro-fiber slime that expands when combined with water and chokes its attackers. 00:59