| Ticks | ||||||||
|---|---|---|---|---|---|---|---|---|
| Scientific classification | ||||||||
| ||||||||
| Families | ||||||||
|
Ixodidae - Hard ticks
Argasidae - Soft ticks | ||||||||
Tick is the common name for the small wingless arachnids that, along with mites, comprise the order Acarina. Ticks are external parasites, living off the blood of mammals, birds, and occasionally reptiles and amphibians.
The major families of tick include the Ixodidae or hard ticks, which have thick outer shells made of chitin, and Argasidae or soft ticks, which have a membraneous outer surface. Soft ticks typically live in crevices and emerge briefly to feed, while hard ticks will embed themselves beneath the skin of a host for long periods of time.
Ticks can transmit human diseases such as relapsing fever, Lyme disease, Rocky Mountain spotted fever, tularemia, equine encephalitis and several forms of ehrlichiosis. Additionally, they are responsible for transmitting livestock diseases, including babesiosis and anaplasmosis. Generally, tick-borne diseases correspond to a specific tick-host combination, and are limited in their geographical extent.
Ticks are often found in tall grass, where they will rest themselves at the tip of a blade so as to attach themselves to a passing animal or human. They will generally drop off of the animal when full, but this may take several days. Ticks contain a structure in their mouth area that allows them to anchor themselves firmly in place while sucking blood. Pulling a tick out forcefully out from under the skin often leaves the head behind. See also Tick removal.