Mother Nature Network: The population has declined steadily through hundreds of years of persecution by gamekeepers, loss of habitat, and also through hybridization with feral domestic cats. It is estimated that anywhere from 35 to 400 pure wildcats are left in the wild, and they are considered one of Great Britain's most endangered mammals. But because they are solitary, elusive, and there are a high number of cats that are actually hybrids, estimating exactly how many pure wildcats are left has proven to be a difficult...