Harrowing scenes of animals screaming in agony have been caught on camera revealing the hidden reality of testing in UK labs, say campaigners. The unprecedented footage was filmed by a worker at two testing plants and shows beagles, primates, mini-pigs, rats and rabbits enduring enormous suffering and distress. In one scene restrained long-tailed macaques have new anti-obesity medication fed into their stomach to help assess if it is fit for human use. The footage also shows masks strapped to