Wildlife Habitat
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Newcastle disease
Newcastle disease is a highly contagious disease of birds that is caused by a virus. There are many strains of the Newcastle disease virus (NDV) which are classified by the severity of the disease each causes in domestic poultry. In North American…
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Mange
Mange is a skin disease that is caused by a microscopic mite. Several species of mange mites generally affect different species of animals. The most common type of mange in wildlife is sarcoptic mange, caused by the Sarcoptes scabiei mite…
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Lead toxicity in wildlife
Lead is a heavy metal that can be highly toxic. It is found in many types of ammunition and fishing tackle. Leaving spent ammunition or tackle can have unintended consequences for wildlife. Wild birds are susceptible to lead toxicity when they…
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Epizootic hemorrhagic disease (EHD) in Wisconsin deer
Update Sept. 16, 2026 – An ongoing EHD outbreak has been confirmed in wild deer in Washington County, and suspected cases are also being reported from Dodge, Milwaukee, Ozaukee and Waukesha counties. The DNR continues to catalogue all reports…
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Deer nasal bot flies
Nasal bots are the larvae of the bot fly (Cephenemyia sp.) and are common parasites that are found in the nasal passages of deer. TRANSMISSION Adult female flies deposit eggs in the nostrils of the deer. The eggs hatch into larvae and then…
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Deer liver flukes
Liver flukes (Fascioloides magna) are flatworm parasites that may be found in the liver of some deer. Adult flukes are purple-gray in color, flat and oval-shaped. The flukes vary in size from 1.5-3 cm wide to 3-10 cm long. They may look like leeches…
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Deer fibroma
Fibromas are firm, nodular, fleshy masses attached to the skin. They are commonly described as warts. Fibromas vary in size from less than one inch to more than four inches in diameter, and they can be found anywhere on the deer's body, but are most…
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Corn toxicity in ruminants
Corn toxicity refers to two diseases, acidosis (grain overload) and enterotoxemia (overeating disease). Both diseases can cause death in any ruminant, including white-tailed deer and elk, even those in good body condition. While these diseases can…
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Conjunctivitis in finches (Mycoplasmosis)
Conjunctivitis is a medical term to describe inflammation of the membrane that covers the front of the eye and lines the inside of the eyelids. The disease in wild birds was first identified in 1994 when house finches in Washington D.C. were…
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Chytrid fungus (Bsal) in salamanders
Salamander chytrid fungus (Batrachochytrium salamandrivorans or “Bsal”) was first identified in 2013 in Belgium and the Netherlands. Bsal impacts a variety of salamander species (as well as some frog species) and can result in mass mortality…