Britannica Sources used in this answer

How do the claws of sucking lice form a hair-clasping structure?

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human head louse — louse Human head louse (*Pediculus humanus*).

In the suborder Anoplura (sucking lice), the hair-clasping structure is formed by a single claw that is opposed to a tibial process. This specialized arrangement allows the louse to securely grip the hair of its host.12