Biri

Biri are recurring enemies in the Legend of Zelda series. Biris are small bio-electric jellyfish. They are most often produced when a Bari is attacked, but occasionally appear alone. These enemies are easily dispatched with ranged weapons like the Boomerang or Hookshot.

The Legend of Zelda: A Link to the Past
Biri appear only once Link defeats a Red Bari. They are much smaller than their parent Bari, but have the same attack pattern. They hover above the ground, moving slowly, and at intervals charge their bio-electric fields, shocking Link if he hits them with his sword.

The Legend of Zelda: Ocarina of Time
Biri are found Inside Jabu-Jabu's Belly. They float through the air towards Link, and upon hitting him, they deliver a bio-electric shock and subsequently retreat out of reach. They are vulnerable to the Kokiri Sword, but Link is shocked if he hits one. They are immune to the Slingshot, but once he obtains it, the Boomerang can kill Biri from a safe distance. While carrying Princess Ruto through the dungeon, she can also be thrown at them for damage.

The Legend of Zelda: Phantom Hourglass
Biri are found floating above the ocean when sailing around the World of the Ocean King. Since they are not techically enemies, they can't do any damage to Linebeck's ship. They will pop out of the ocean at random times and slowly drift towards the water. Each time they are shot with the canon, they will drop one green rupee and float upwards a couple feet to slow their descent. Ocasionally, they will split, allowing the player to have a maximum of three Biri onscreen at one time.