Ticks are a particular genre of arthropods descending from the families of invertebrates with external skeletons. They cannot be classified under any form of insect or spider family, but fall under the category of mites. It can be said that all ticks are a minor group of bugs, but not all mites can be called ticks. A long and exhausting list of ticks exist within the world, yet it must be observed by select members of the society, such as those who work in botany and animal study. The reason being, that ticks mostly affect animals and at a lower level, humans. Being carnivorous in nature the parasites have tremendous ability to cause damage at large scale.
Like most predatory animals, ticks feed on blood. Due to their nature of latching onto a host for long periods of time that extend from days to months, they are called external parasites. For a while they cannot enter the body and exist within, the most they can do is to bury their mouth segments into the lower levels of the skin. Upon the blood they feed, they can further develop and produce eggs. Feeding on nothing but blood they have a dependency upon it, and without it, they cannot survive. With these blood-sucking tendencies, the more they ingest, the bigger they grow. They can turn from brown into a greenish-blue color on continuous feeding.