Otobius lagophilus is a soft-bodied tick that is only parasitic in the larval and nymphal stages.

The tick's parasitic forms are usually found within the ears of the definitive host particularly rabbits and in rare cases cats.

[1] Otobius lagophilus ticks are generally associated with semiarid or arid environments such as those found in the Southwestern United States.

They have been observed in California, Colorado, Idaho, Montana, Nevada, Oregon, and Wyoming, but have in isolated cases been seen as far north as Alberta, Canada.

The most common hosts are rabbits, with the ticks attaching themselves particularly around the face and ears, although in rare cases, cats have also served this role.