Bees

Bees are small flying insects that attack in swarms.

A swarm of bees could be heard attacking Gwaine in the forest while on a quest, but they were not physically seen and he seemed only bothered and not harmed by them. Bees were in Merlin's age probably the same as they are in this age, with the same instinct, habits and variety. The bees encountered, most likely by intruding in a bee's territory or near their hive, were not deadly and only seen as a nuisance or a pest (The Darkest Hour).