The pond above my house has them.
[found out the hard way]
Last year I went back to a local crick to take photos and noticed odd little 'holes' in the mud under an overhanging tree.
So naturally, like an over-curious idiot, I waded in, thinking it might be crayfish nests or something.
Nope.
Leeches.
As soon as I stepped into their area, they came swarming out after my feet.
YIKES!
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