How do fleas move through an animal’s hair or feathers?

Fleas are anatomically specialized to navigate their hosts efficiently. Their bodies are laterally compressed, which allows them to move swiftly through the hair or feathers of an animal.1

To maintain their position, they utilize backwardly projecting spines or combs that serve to anchor them securely within the fur, hair, or feathers. While they are well-known for their powerful jumping ability, these structural adaptations are essential for their movement and stability while living on a host.1