New mammal species from the age of the dinosaurs have been discovered, increasing known diversity from that era.
http://www.nytimes.com/2015/02/17/s...on®ion=bottom-well&WT.nav=bottom-well&_r=0
http://www.nytimes.com/2015/02/17/s...on®ion=bottom-well&WT.nav=bottom-well&_r=0