Buggernaut
From Sonic Retro
Buggernaut (Bun-bun in the Japanese Manual) is a blue mosquito robot found in Hydrocity Zone. In behaviour, they are very similar to the Whisp. They attack in groups of 2 (the adult mosquito and the young mosquito). When the adult badnik is destroyed, the smaller one flies away in panic. They can be easily destroyed by jumping. "Bun-bun" is a Japanese word for buzz.