Ixodes ricinus ticks

This is a male Ixodes ricinus tick (smaller) shown copulating with a female tick (larger). I. ricinus, the "castor bean" tick, so called because of its resemblance to the castor bean, is a vector for the B. burgdorferi spirochete, the cause of Lyme disease, and is commonly found on farm animals, and deer who are the natural host.

By WHO [Public domain], via Wikimedia Commons

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