This is a real nutria skull (Myocastor coypus)!
Also known as a coypu, these are large, semi-aquatic, rodents native to South America.
They have since been introduced as an invasive species to North America, Europe and other regions as a source of fur.
These skulls measure ~4.5" long and can be shipped worldwide.
**This skull has minor damage to the back of the jaw, as seen in the photo.**