The limpets resemble spiders and crabs. They can latch onto the bottom of a city. The Limpet has room for about three crew members.
The Lost Boys use limpets to steal from raft and ice cities. One of the limpets was kept at Anchorage in Vineland. When Brighton were capturing the Lost Boys, the limpets they caught were put in the Brighton museum. Anna Fang and Fishcake steal a limpet from Brighton to swim upstream.