Bari

Bari are recurring enemies in the Legend of Zelda series. Bari are bio-electrical jellyfish that are found within caverns and dungeons. Their exact characteristics differ between games, but they are usually able to hover. Some Bari, when attacked, split into two smaller jellyfish called Biri.

The Legend of Zelda: A Link to the Past
Bari inhabit caves and every dungeon in the Dark World. These Bari have semi-spherical bodies with stubby tentacles. They come in two versions; blue and red. They move slowly, and can damage Link by electrocuting him with bio-electric energy. They can only charge up and release the energy for a short while before having to re-charge again. If Link touches one while it is releasing electricity, he will be electrocuted and take damage. Any sword attacks will also give Link a shock in this state. The blue ones can be defeated with a single sword attack. When defeated, red Bari split into two Biri when slain with most weapons, although the Fire Rod will kill them without them splitting up. The Hookshot is particularly effective at defeating both varieties of Bari from a safe distance.

The Legend of Zelda: Ocarina of Time
Bari in Ocarina of Time are parasitic jellyfish that only appear Inside Jabu-Jabu's Belly. More uncommon than Biri, Bari are larger and heavier, and have two scythe-like tentacles. They fall from the ceiling with a crash and then move towards Link, whirling. Once attacked, they split into three Biri. If Link throws the Boomerang at a Bari, it will only be stunned. If Link tries to damage one with his sword, he is electrocuted. However, the damage to the Bari still occurs.

The Legend of Zelda: Oracle of Ages
Bari appear in Jabu-Jabu's Belly. Their attacking style is virtually identical to that of Bari from A Link to the Past.

The Legend of Zelda: Twilight Princess
Bari can only be found in the Lakebed Temple. They are found floating around large pools of water and underwater caverns. If Link gets too near to them they will electrocute him when they touch, but after Link gets the Clawshot, he can pull out their innards to defeat them. If he uses the Clawshot while the Bari is producing electricity, however, the electricity will move down the Clawshot to Link and electrocute his as if he had directly touched the Bari.