Rock star Brian May will today lead a rally against planned badger culls, due to begin from this weekend in an effort to tackle bovine TB.
The Queen guitarist, a long-time campaigner against the plan, will be joined by TV naturalist Bill Oddie as they lead a march through Westminster.
Organisers say they expect thousands to join them, all wearing badger masks, in an effort to demonstrate their opposition to the culls, the pilots for which are in west Gloucestershire and west Somerset.
Some 5,000 badgers are set to be killed in the two south west regions, with policing costs expected to reach £4 million to cope with potential disruption from activists.
Police last night said they were "prepared" for any disruption and protests.