Are there any primary source documents reporting "monster" sightings in North America during and/or before the American Revolution?

by AcerbicMime

Secondary sources will work too if anybody's done research on this, but I'm primarily interested in things like journal entries by early explorers, colonists, or soldiers. I'm not out to prove or disprove anything, I just think this would be fun to read about. Thanks Reddit!

ForExes

/u/mikedash answered pretty much this exact question here