ANTI-MONARCHY campaigners are to demonstrate at the Commonwealth Day service in London next month — with a new 15ft dinosaur mascot called Chuck the Rex.

Republic’s prehistoric protest puppet is said to symbolise the “antiquated monarchy,” which the group describes as a “relic of a bygone age and a fossil that belongs in the museum.”

The fully mobile Tyrannosaurus rex wears a golden crown and has his own social media page on X — @ChuckTheRex.

“Unlike Charles, Chuck knows he’s out of place and out of time,” Republic said.

“He wants to get out and about and have a roaring time highlighting the need for a modern, democratic alternative to the monarchy.”

Protesters will bring Chuck along when they gather at the Commonwealth Day service at Westminster Abbey on March 10.

The King is also sovereign of 14 Commonwealth realms in addition to Britain, while the Commonwealth as a whole is a voluntary association of 56 independent nations, almost all of which were formerly under British rule.

A number of the realms including Jamaica, the Bahamas, Antigua and Barbuda, Saint Kitts and Nevis, and Saint Vincent and the Grenadines have expressed interest in becoming republics.

Graham Smith, chief executive of Republic which campaigns for an elected head of state, said: “There is growing opposition to the royals, and growing disinterest in them.

“There is also lasting residual anger at their profiteering from charities and public services.

“The duchies [of Lancaster and Cornwall] are not their private property, those profits should be going back to local communities.

“It’s no wonder that while support is falling in the UK, Commonwealth citizens are increasingly looking to ditch the monarchy.”