Wikipedia
Tick
Tick is the common name for the small arachnids in superfamily Ixodoidea that, along with other mites, constitute the Acarina. Ticks are ectoparasites (external parasites), living by hematophagy on the blood of mammals, birds, and occasionally reptiles and amphibians. Ticks are vectors of a number of diseases, including Lyme disease, Q fever, Colorado tick fever, tularemia, tick-borne relapsing fever, babesiosis, ehrlichiosis and Tick-borne meningoencephalitis, as well as anaplasmosis in cattle and canine jaundice.
Young ticks have six legs, and mature ticks have eight legs. They vary in size and appearance depending on the species.
Habitats and behaviors
Ticks are blood-feeding parasites that are often found in tall grass and shrubs where they will wait to attach to a passing host. A tick will attach itself to its host by inserting its chelicerae (cutting mandibles) and hypostome (feeding tube) into the skin. The hypostome is covered with recurved teeth and serves as an anchor.Matthews, Bernard E. 1998. An introduction to parasitology. Cambridge University Press.
Physical contact is the only method of transportation for ticks. Ticks do not jump or fly, although they may drop from their perch and fall onto a host. Some species stalk the host from ground level, emerging from cracks or crevices located in the woods or even inside a home or kennel, where infestations of "seed ticks" (the six-legged stage of newborn ticks) can attack in numbers up to 3,000 at a time. Weak or elderly dogs and puppies are particularly endangered and can die from anemia from a sudden influx of seed ticks. Seed ticks also attack horses, cattle, moose, lions and other mammals, causing anemia, various diseases, paralysis and even death. Such infestations can be difficult to detect until thousands have attached themselves to an animal and eradication can be difficult.Transcript, Dr. Bill Samuel, Author and Associate Dean, Research, Faculty of Science, Univer read more at » http://en.wikipedia.org/wiki/Tick