Some of the cliffs and overhangs at Keyhole Reservoir. American cliff swallows, also known as mud sparrows, nest along the overhangs.

The Wyoming Department of Environmental Quality is investigating potentially harmful bacteria in the water at Keyhole State Park.

The bacteria in question, harmful cyanobacterial bloom, is a blue-green algae that blooms on the surface of water, usually during hot summer months and produces potentially harmful toxins into the surrounding water, according to a park press release.

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