This may seem like another installment of our “Cryptid Catalog” series, but this is no urban myth: according to a report at the site Mother Nature Network, an invasive species of carnivorous catfish called the Northern Snakehead – a species which can climb out of the water and squirm around on land for short periods of time – is on the loose in NYC's Central Park.
The Snakehead has been a big problem for wildlife authorities, not only because it eats just about any fish or small animal it can get a hold of, but it also has no natural predators in the US and reproduces often, so it can dominate an aquatic ecosystem very quickly. It looks pretty monstrous too – which is cool, but maybe not so fun when it decides your pet Pomeranian could fit in its mouth. (In all fairness, no pet-eating incidents have been reported... yet.) According to the article, NYC wildlife agents are conducting surveys of the water in Central Park, and have requested citizens who spot it to capture it and "keep it in a secure container until it is picked up by officials."
The Snakehead has also been found in Maryland, California, Florida, Maine, Massachusetts, Rhode Island and Hawaii, so apparently the invasion is well underway. It's not quite a Humanoids from the Deep scenario yet, but time will tell...