Lipoptena depressa, or the Western American deer ked, is species of fly in the family Hippoboscidae.

Adults can only fly approximately 50 meters, so their success depends on the density and distribution of the host mammals.

[2] Lipoptena depressa is found in the western part of the United States including Washington, Oregon, California, Idaho, Montana, South Dakota, Colorado, and Utah as well as Alberta, Canada.

Ticks are much more common than deer keds, and they are able to thrive on a variety of mammals, including humans and dogs.

Recent papers bring up the possibility of deer keds spreading diseases due to their expanding range in the face of climate change.