At first, they were just two bumps, but they started to grow quickly, and after a month there were two wings," she said. Feng, of Xianyang city, Shaanxi province, says the wings, which contain bones, make her pet look like a 'cat angel'. Her explanation is that the cat sprouted the wings after being sexually harassed. "A month ago, many female cats in heat came to harass him, and then the wings started to grow," she said. However, experts say the phenomenon is more likely down to a gene mutation, and say it shouldn't prevent the cat living a normal life.