These annoying flyers can be used to aid in taming otters. Just set the hunt and retrieve feature on it, make it attack a fish, and as it comes back to you grab the fish and walk up to the otter and press the button to tame. Otters are quick tames, and provide insulation from both the heat and cold which directly depends on their melee stat. They can also hold multiple artifacts in their inventory. Can be found in shallow rivers.