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Questing Dermacentor varabilis

Questing Dermacentor varabilis

When seeking a host, ticks such as the American dog tick (Dermacentor variabilis) wave their forelegs, in a behavior called “questing.” The ticks’ forelegs feature tiny sensory pits called Haller’s organs used to detect a passing host. (Photo credit: Tanya Josek)

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