It's actually a shark

• Head of oceanography leaving unfortunate dog for shark
• Voracious pointed-nose shark of northern Atlantic and Pacific

WordNet Word definitions in WordNet
n. voracious pointed-nose shark of northern Atlantic and Pacific [syn: Lamna nasus ]

Wiktionary Word definitions in Wiktionary
n. A large pelagic predatory shark, ''Lamna nasus'', of the Atlantic.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Porbeagle \Por"bea`gle\, n. (Zo["o]l.) A species of shark ( Lamna cornubica ), about eight feet long, having a pointed nose and a crescent-shaped tail; -- called also mackerel shark . [Written also probeagle .]

Wikipedia Word definitions in Wikipedia
The porbeagle ( Lamna nasus ) is a species of mackerel shark in the family Lamnidae , distributed widely in the cold and temperate marine waters of the North Atlantic and Southern Hemisphere . In the North Pacific , its ecological equivalent is the closely ...