One of the most infamous sea serpent episodes spanned decades. From 1817-19, a mass of people, including fishermen, military personnel, and pedestrians, reported seeing a sea monster at least eighty, but perhaps one hundred feet, long, with a head resembling a horse, in the harbor off Gloucester, MA. There were so many eye-witness reports that the Linnaean Society of New England formed a special investigating committee to examine the possibility of such a creature.
I picked this paragraph because it interested me about the sea serpent or "sea monster" but there wasn't much about it in this article. Yet what there was written caught my attention, like "a head resembling a horse" on a sea creature seems interesting.