What is a distinguishing characteristic of fleas?

A distinguishing characteristic of fleas is their narrow bodies equipped with specialized spines. This unique body shape allows fleas to move easily through the fur or feathers of their hosts, facilitating their parasitic lifestyle. The specialized spines, often referred to as "combs," help prevent the flea from being easily dislodged while feeding on the host. This adaptation is crucial for their survival and reproduction.

In contrast, fleas do not possess wings for flying; they are known for their remarkable jumping ability instead. Their limbs are specifically designed for jumping rather than grasping. Additionally, fleas do not have the capability to spin webs, which is a characteristic associated with certain other types of insects, like spiders. These factors underscore the specialized adaptations that enable fleas to thrive in their ecological niche as blood-feeding parasites.