"Have you ever been to the La Brea tar pits?"

The La Brea Tar Pits in Los Angeles, California, are naturally occuring pools of crude oil or tar. Over a period of hundreds of years, animals visiting the area to drink from the pools of water that would form over the tar would become trapped, sucked into the oil, which then preserved their bones; species found there include sabre-toothed cats, mammoths, the American camel, llamas, horse, bears and wolves, some dating from the time of the last Ice Age.