A painting depicts an asteroid slamming into the Yucatan Peninsula approximately 65 million years ago. The asteroid wiped out the dinosaurs and paved the way for mammals to dominate, but it took another 10 to 15 million years for the ancestors of today's mammals to really take over, scientists said on Wednesday. (Reuters Photo) Photo Gallery>>>

A replica of a Maxakalisaurus topai dinosaur skeleton is seen at the National Museum in Rio de Janeiro in August 2006. Most modern mammals can be traced to a surge in biodiversity that occurred long after the dinosaurs were wiped out, according to a new study that challenges a keystone theory about life on Earth.(AFP Photo) Photo Gallery>>>

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