Western fence lizard, Sceloporus occidentalis, with western black-legged tick, Ixodes pacificus, carrier of Lyme disease in California.  Researchers at UC Berkeley have found that fence lizards' blood contains a substance that kills the Lyme disease bacterium, Borrelia burgdorferi, when a lizard is bitten by a tick.  This may explain the relatively low incidence of Lyme disease in California.