Ticks are not insects. They are arthropods that are
more closely related to spiders. Adult ticks have
eight legs while insects have six legs. Ticks are ectoparasites
which means that they must have a host for each
stage of their life cycle in order to survive and reproduce.
The tick life cycle includes an egg, larval,
nymphal, and adult stage. The larval stage of the tick
has six legs, but when it molts to the nymphal stage
there are eight legs. Ticks are more resistant to drying
out than other insect pests.