The Tata Duende (also referred to as El Sisimito) is a mythical goblin of folklore of Belize, considered as a powerful spirit that protects animals and the jungle. This creature has appeared on a postage stamp of Belize as part of a series on the folklore.

The Tata Duende is generally described as being of small stature that has a size of about 1.2 m high, has a beard, is wrinkled, lacks thumbs, has his feet backwards, and wears a large brimmed hat.

He is characterized as a very short but very strong man that was hairy and looked like a gorilla. El Sisimito was said to have his feet backwards. In other words, his heels were at the front and the toes at the back. Therefore whenever you saw his footprints, if it looked like they were going north or away from you, indeed he was heading south and towards you. His feet were quite large for his size and his toes were spread out. Neither did he have a knee, so his movements were quite awkward.

The creature was investigated on a 5th season episode of Destination Truth, where it was speculated that Tata Duende sightings might actually be of the indigenous spider monkey.