” Another day, another monster? Not quite, this time. A large aquatic animal, apparently carnivorous, has washed up in New Zealand. The body is badly decomposed, and suggests a crocodilian head with a twin fin tail.

 
Sydney Morning Herald article suggestions so far contain just about everything:

 

A marine mammal expert from the Museum of New Zealand, Anton van Helden, told NZ media that based on the creature’s fins, it was most likely to be a killer whale. The body had probably been floating around at sea for some time before it washed up, he said.

 

The orca suggestion isn’t quite so far fetched, despite the apparent crocodilian resemblance. Orca teeth are similarly structured, and hooked. Information from the Orca Project shows distinctly similar teeth.”