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[[Image:CDC tick chart.jpg|right|thumb|250px|Several examples of tick found in the United States]]
'''Ticks''' are a group of species of [[arachnid]] known for their parasitic life-style. They have four pairs of legs and are effectively balloons with mouth parts. They are known for transmitting [[Lyme disease]], usually by the [[sheep]] or [[castor bean]] tick, ''Ixodes ricinus''.<ref>http://www.cfsph.iastate.edu/Factsheets/pdfs/ixodes_ricinus.pdf</ref>
Ticks have a complex life cycle involving both nymphal and pupal stages, which requires blood meals between each. There are two main subgroups of ticks, hard ticks and soft ticks.
==References==
{{reflist|2}}
[[Category:Invertebrates]]