The New York City Parks Department claims that this is a pig:
"I definitely agree that the feet are not pig-like at all," [Denise] Ginley confirmed to Daily Intel. "No hooves or cloven feet to be seen—it definitely had five toes on all its paws, front and back." She added, "I think it could be a monstrously huge rat, but it could also be a monster." (Via.)
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