Shark

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Sharks are a small part of the Club Penguin wildlife. They appear in the mini-games of Ice Fishing, Catchin' Waves, Jet Pack Adventure, Hydro Hopper, and Puffle Rescue.

Behavior

Sharks appear to be quite aggressive, and will attack penguins, worms and puffles if they get close enough. There was once a rumor that the Silver Surfboard attracted sharks- it was proven false when Aunt Arctic was asked in the Club Penguin Times.

It is unknown how big they are, but Rockhopper has said there is a shark longer than the Migrator.

In Ice Fishing, it will try to bite your rope with the bait on it.
In Hydro Hopper, its fin appears above the water and is one of the obstacles.
In Jet Pack Adventure, it is seen jumping out of the water.
In Catchin' Waves, it will trying to knock you off your board in survival mode later in the game.
In Puffle Rescue, when you're playing blue puffle mode, sharks attack you.
At the Pizza Parlor during the Island Adventure Party 2011.

In Puffle Rescue, sharks can break through ice, although in reality they cannot.