 The mountains are also home to the Western fence lizard.In 2010, the "Los Angeles Times" reported that the New Zealand mud snail had infested watersheds in the Santa Monica Mountains, posing serious threats to native species and complicating efforts to improve stream-water quality for the endangered steelhead trout.According to the article, the snails have expanded "from the first confirmed sample in Medea Creek in Agoura Hills to nearly 30 other stream sites in four years."