Horse leech

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a less powerful European leech (Hæmopis vorax), commonly attacking the membrane that lines the inside of the mouth and nostrils of animals that drink at pools where it lives.

See also: Leech

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
Haemopis is commonly known as the "horse leech" because it lives in ponds, sloughs, and marshy shallows where it occasionally attacks horses, cattle, moose, and even humans.
"The horse leech is also quite common in the garden, in damp, marshy areas and can be found under stones and logs.