Why do yeti crabs have fur?

Yeti crabs, specifically those from the genus Kiwa, have a unique set of hairy bristles on their pincers that are actually soft setae. These bristles serve to cultivate and house bacteria, which the crabs rely on for nourishment, particularly in the nutrient-poor environments of hydrothermal vents. The bacteria process sulfur compounds from the vent water, providing a symbiotic food source for the crabs while also helping to filter toxins. This adaptation is crucial for their survival in extreme conditions.