In addition to being parasites themselves, copepods are subject to parasitic infection. Nests can become home to many other organisms including parasites and pathogens. Worms are the most common internal parasites. There are many causes of infectious diarrhea, which include viruses, bacteria and parasites. Catte suffered from intestinal parasites and ticks. These insects are known as entomophagous parasites. Abscesses are caused by bacterial infection, parasites, or foreign substances. Fungi include symbionts of plants, animals, or other fungi and also parasites. Their thick fur resists parasites, such as fleas, and reduces loose dander. Neanderthals were likely subject to several infectious diseases and parasites. This mechanism is observed during infection with other obligate intracellular parasites, as well. Close relatives of the human malaria parasites remain common in chimpanzees. The peregrine falcon is host to a range of parasites and pathogens. These granules contain proteins that are toxic to parasites. Taken internally it was used as a treatment for intestinal parasites.