The annually occurring 'lumps' on tree squirrels (see pictures above) are most likely the result of infestation by the tree squirrel bot fly,
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entnem.ifas.ufl.edu/slansky/botfly/ABOTFLY/overview.htm
entnem.ifas.ufl.edu/slansky/botfly/ABOTFLY/overview.htm
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Nature: The Tree Squirrel Bot Fly, Cuterebra emasculator, is a parasite of small rodents in South Carolina and elsewhere in the U.S. Our squirrels at Hilton Pond are hosts for larvae of the Tree Squirrel Bot Fly, Cuterebra emasculator, whose species name may be a bit over-dramatic; i.e., Bot Flies can cause problems...
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www.hiltonpond.org/ThisWeek040915.html
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Provides photographs and a description of this obligate parasite of squirrels and chipmunks, its distribution, life cycle and impact on its hosts.
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entnemdept.ufl.edu/creatures/misc/flies/squirrel_bot_fl...
entnemdept.ufl.edu/creatures/misc/flies/squirrel_bot_fly.htm
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CANON FS100 - warble pores on squirrel caused by bot fly. Added to. Quicklist1:31 · CANON FS100 - warble pores on squirrel caused b... 11594 views...
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www.youtube.com/watch?v=glrXWd_ykeI
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When squirrels are acting "nutty," it is often caused by a warble or bot fly larva living beneath the animal's skin.
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www.pestproducts.com/pests/nuttysquirrel.htm
www.pestproducts.com/pests/nuttysquirrel.htm
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At the University of Florida Other Florida Resources The Tree Squirrel Botfly (Slansky)
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Department of Natural Resources - Warbles Warbles are the larval stage of the botfly, which characteristically infect rodents and rabbits. They are found under the skin, usually around the legs and neck. They have also been reported from deer, cattle, cats, dogs, hogs, mules, mink, foxes and man. Squirrel Pox...
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www.michigan.gov/dnr/0,1607,7-153-10370_12150_12220-263...
www.michigan.gov/dnr/0,1607,7-153-10370_12150_12220-26354--,00.html
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The lumps or nodules (= fibromas) of squirrel fibromatosis (also known as squirrel fibroma or squirrelpox) are caused by the squirrel fibroma virus, a poxvirus closely related to the myxoma and Shope's fibroma viruses that infect rabbits (i.e., all of these are classified in the Leporipoxvirus genus of the Poxviridae...
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entomology.ifas.ufl.edu/slansky/botfly/fibroma/fibrintr...
entomology.ifas.ufl.edu/slansky/botfly/fibroma/fibrintr.htm
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The squirrels in our backyard (central NC) sport large botfly warbles every summer. A couple of years ago, I had the opportunity to examine some up close, after I shot a squirrel that kept chewing on the siding of our house.
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scienceblogs.com/aetiology/2006/03/weekend_botfly_blogg...
scienceblogs.com/aetiology/2006/03/weekend_botfly_blogging.php
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