Lockjaw

Lockjaws are red piranha-like fish that inhabit the waters of Crocodile Isle and Donkey Kong Island. They first appear in Donkey Kong Country 2: Diddy's Kong Quest. Lockjaws have an invincible purple variant, Snapjaw.

Donkey Kong Country 2: Diddy's Kong Quest / Donkey Kong Land 2
In their debut appearance, Lockjaws appear in most underwater levels. When Diddy Kong and Dixie Kong approach a Lockjaw, it clamps its jaws and then lunges at the lead Kong in an attempt to bite them. Lockjaws can only be defeated by Enguarde the Swordfish by stabbing them. The Lockjaws in the later levels often move faster than in earlier levels.

Lockjaws also appear in Donkey Kong Land 2 where they have the same role in-game. A Lockjaw also appears on the boxart, trailing after Diddy and Dixie.

DK: King of Swing / DK: Jungle Climber
Lockjaws reappear in DK: King of Swing mainly appear in the Aqua World, and they first appear in the level Risky Reef. Lockjaws attempt to charge at Donkey Kong or Diddy Kong and bite them, and the Kongs can defeat a Lockjaw by using a charged attack. Lockjaws are the main and titular feature of Lockjaw Falls, where they jump out from the waterfalls and attempt to hit Donkey Kong or Diddy Kong. Lockjaws also appear in the sequel, DK: Jungle Climber.

Donkey Kong Barrel Blast
Lockjaws also appear in Donkey Kong Barrel Blast as rare enemies only found on DK Jungle Falls and DK Jungle Sunset. Here they attack players by jumping out of the water and attempt to bite them. There are also electrified variants of Lockjaws. Both of them can be defeated in one hit, though the electrified Lockjaw will also significantly slow down a player unless that player was invincible.