Is a yeti crab mammal or reptile?

Yeti crabs are neither mammals nor reptiles. They are crustaceans, specifically belonging to the family Kiwaidae.

Here's why:

* Crustaceans are part of the arthropod phylum, which includes insects, spiders, and scorpions. They have a hard exoskeleton, segmented bodies, and jointed appendages.

* Mammals are warm-blooded vertebrates with fur or hair, mammary glands, and give birth to live young.

* Reptiles are cold-blooded vertebrates with scales, lay eggs, and have a three-chambered heart.

Yeti crabs share characteristics with other crustaceans like lobsters, crabs, and shrimp.