He's been making other cats green with envy but a Bulgarian moggy's mysterious emerald coat may finally be explained.

Locals believed that the green feline, who was first spotted in the Bulgarian seaside town of Varna, had been attacked and painted the unusual shade by vandals, even setting up a Facebook group to catch the perpetrators.

Gradually, it is believed that the paint slowly covered the entire cat – giving him his unusually vibrant appearance.

The colour also appears to show no sign of wearing off as each nap the cat takes just makes the colour stronger.