This is a large group of very tiny, almost microscopic mites that, among them, parasitize all classes of vertebrates except fish.
They are all ectoparasites, that is, they live on the outside of the host’s body, as opposed to endoparasites, which live inside the host’s body.
Chiggers are parasitic only as very young immatures just hatched from the egg.
Later in life, they are probably predators, possibly feeding on the eggs of small insects such as springtails.
Chiggers are found throughout the world, and they tend to be more prevalent in the hot and humid parts of Europe and North America.