When people think of extinct species that once existed alongside humans, some might conjure up images of woolly mammoths, saber-toothed cats and other massive Ice Age animals. These prehistoric creatures went extinct during the late Pleistocene and early Holocene, which began around 11,700 years ago. Yet there are also animals that survived this extinction period and lived long enough to encounter ancient civilizations, only to die out later.
Here are six of those now-extinct animals and the factors that may have contributed to their demise.