Killer bees

The Buzz Swarm is a group of miniature red Buzzes in Donkey Kong Country 3: Dixie Kong's Double Trouble!. They only appear in the stage Riverside Race, where they will chase after Dixie and Kiddy Kong until they reach the Level Flag. However, they will not pursue the Kongs while underwater and cannot harm them when invincible.

Buzz Swarms are likely just incentive to finish the stage as quickly as possible to beat Brash's time. Their presence also makes it difficult to access things such as the Warp Barrel and Koin.