A mermaid is thought of as a marine creature with a humanoid top half and the bottom a fish. These are clearly not that. Like Doc said, that is a fish. I didn't know what it was, but I'm sure he is correct on its species. At first I thought it was a squid with an odd imprint before I saw its tail and no tentacles as the video progressed.

The second one was indeed a hoax that someone had put together. Unfortunately, I doubt there is a such thing as a mermaid that some myths speak of. Back then someone fisherman may have seen something, the sea can cause hallucinations much like the dessert after all if you stay out long enough, but we will never know until divers actually find something. Hopefully, someone more credible than the person who created that creature in the second video.

Once again, not all YouTube videos should be watched as fact.

If you see something amazing, you should probably do some research on it.

Chances are you will discover that most of these videos are either viral marketing, a hoax or mis-indentification of a known species (due to a number of reasons, including state of decomposition).

It sort of looks like a Brian Davis sideshow gaff but there is more detail in that one. It could be a high end model he has done. Its not a Higley, which is the gold standard. When you look at a Higley even when you see the receipt for it you will wonder how the hell it can look so real. None of those sewed together things.