The Horniman Merman (aka “Herman”) is a fake mummified creature believed to have originated in Japan, and now resides in London’s Horniman Museum. Its actual provenance is unknown, but likely made its way west via sailors doing business in Asia 200 years ago. In 2011, Herman was decompounded using a CT scan to reveal just what he was made of (here is a nice video going through the unveiling). Turns out Herman is made of fish (likely carp), papier mache, wood, wire and clay.
With a face only a mudder could love, he’s not much to look at, but you have to admire the detail and artistry that went into creating this little guy.