Walker the polar bear plays after being weighed at Highland Wildlife Park in Scotland Walker, the only polar bear on public display in the UK, was lured on to the scales with his favourite fishy treats today to allow keepers to weigh him. Walker was given a trail of sardines to follow to tempt him on to a large wooden platform attached to a set of scales which revealed he has gained around 330lb (150kg) in just over a year. Picture: Andrew Milligan/PA