Morrissey writes open letter slamming Prince William on a hunting trip the day prior to launching a campaign to save endangered animals.
The musician posted on fansite True-to-you.net calling the Duke of Cambridge a "thickwit".
Prince William and Prince Charles released a video message yesterday urging everyone to protect rhinos, elephants and tigers.
It subsequently emerged that he spent the day before hunting wild boar and stags on a private estate in Spain with his brother, Prince Harry.
An outraged Morrissey, a committed vegetarian, retorted:
"Although William's speech (no doubt written by his publicity aides at Clarence House) will concentrate on endangered species, William is too thickwit to realize that animals such as tigers and rhino are only driven to near extinction because people who are precisely like himself and his brother have shot them off the map - all in the name of sport and slaughter," the be-quiffed one penned.
"The rationalists amongst us" could "only pray to God that their hunting guns backfire in their faces".