It charges the energy in their body, allowing more forceful and frequent jumps than would be possible relying on only their muscles.

They mainly feed on mammal blood, and many Siphonoptera families, including Pulicidae, transmit disease.

They prefer to feed on areas round the head and neck of a cat, rather than the ventral part of the body.

As for their effect on humans, they are also responsible for flea bite allergy dermatitis.

[5] Additionally, Pulicidae transmit Yersinia pestis, the bacteria responsible for plague.