Life Cycle
Ixodes ricinus has a three-host life cycle, which usually takes 2–3 years to complete, although it can take from 1 to 6 years in extreme cases. Adults feed on large mammals such as sheep, cattle, dogs, deer, humans and horses for 6–13 days, before dropping off. An engorged female will lay several thousand eggs and subsequently die. The larvae that hatch do not actively seek a host, and usually feed on insectivores (orders Erinaceomorpha and Soricomorpha), although they may also find rodents, rabbits, birds reptiles or bats. They feed for 3–5 days before dropping off and moulting. The resulting nymphs then ascend grasses or twigs to seek their next host, but must return to the moist microclimate at the soil surface if they become dehydrated. The nymphs feed on small to medium-sized mammals.
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