Giant Water Scavenger Beetle

Any help identifying this bug?
St. Louis, MO.
Just found it out on the front lawn and never seen one like it. About 2 inches long and 1/2 inch wide. Thanks.
sent in by Taylor and Morgan Ratliff

Dear Ratliff Family,
This is a Giant Water Scavenger Beetle, Hydrophilus triangularis. These beetles are found in ponds and slow streams throughout North America. They leave the water and fly on summer nights and are often attracted to lights. They eat the decaying remains of aquatic animals and occasionally feed on small living animals. This is a new species for our site.

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