Bigocto (Ocarina of Time)

 Bigocto  is the mini-boss of Inside Jabu-Jabu's Belly, the third dungeon in The Legend of Zelda: Ocarina of Time. A large, octopus-like creature, Bigocto's origin is unknown.

Story
While Link and Princess Ruto are searching for the Zora's Sapphire, they come across a strange platform containing the Spiritual Stone. Princess Ruto demands Link throw her up to grab it, and when he does so, it ascends upward and through a hole in the roof. Here, Ruto meets Bigocto who presumably takes her hostage and rides the lift down to confront Link.

Battle
To defeat Bigocto, Link must run around the spinning circular platform, while avoiding the spikes, in the opposite direction it is moving. When he comes close enough to the beast, he must throw the Boomerang at the green orb protruding out of its body, effectively damaging it. It returns after being stunned for a short while and turns around to chase Link. Link must repeat the process again to defeat it. Oddly, the Bigocto can be killed in one hit by performing a Jump Attack with a Deku Stick.