Queen guitarist Brian May has joined a legal challenge in Swansea to try to stop a plan to cull badgers in parts of mid and west Wales.
The animal charity, Badger Trust, has applied to the High Court for a judicial review of the proposed cull, aimed at combating the bovine TB infection.
Welsh Assembly Government: Bovine TB
But Dr Christanne Glossop, chief veterinary officer for Wales, has defended the proposed cull.
"We have a bovine TB crisis that we can't ignore and which needs to be dealt with as quickly as possible," she said.
"We have spent over £100m in the last 10 years in trying to control it, but it has escalated now to an unsustainable level and threatens cattle farming across Wales."
She added: "Our programme to eradicate bovine TB is a comprehensive package of measures aimed at tackling the disease in both its main sources, cattle and badgers."
And the Farmers' Union of Wales said May's involvement was a "cynical publicity stunt" and "galling" for those members who had lost out financially because of TB in cattle.
The rock star explained to BBC Wales environment correspondent Iolo ap Dafydd why he was involved.