Biri

The Legend of Zelda: A Link to the Past
In ALTTP, biris come in red and blue, Link must use his sword or boomerang repeatedly to defeat one, but must be careful not to get shocked, they appear in several dungeons, and usually in groups.

The Legend of Zelda: Ocarina of Time
Biris in OoT appear as jellyfish that float in the air, they only appear in Jabu-Jabu's Belly and they will electrocute Link if he touches one. Link can use [Deku Nuts]] to stun them, or use his Boomerang to kill them, however, Princess Ruto may be thrown at them to attack them too.