In Japan the mermaid is known as the ningyo and has ape like features. It is said that eating its flesh brings extreme long life. In the west these were commonly called Nondescripts.
The most famous was created in 1810 by a Japanese fisherman. It was bought by Dutch merchants who then, in 1822, resold it to an American sea captain, Samuel Barrett Eades, for $6000 (at the time, a huge amount of money). Eades had to sell his ship in order to afford the mermaid, but he hoped to make a fortune by exhibiting it in London. Unfortunately he didn’t own the ship and spent the rest of his life in debt!
His son sold the mermaid to PT Barnum who exhibited it in the UK and the USA. It was destroyed in a fire.
Other examples are in museums around the world and some of the oldest are kept in Japanese temples. The CFZ even has an excellent specimen skillfully created by the special effects wizard Alan Friswell. Thankfully he did not use a monkey!