Some 322 birds, mammals and reptiles all went extinct in just the past 500 years due to people, research shows.
A tiger in India is reportedly eating humans. Experts say it's unlikely it will stop at nine.
Moths and dung eating insects live on sloths, and they create algae on its body. The algae serves as a camouflage from predators, and also as a tasty snack! Trace hangs out and discusses how you might not want to hold a sloth anymore.
A polar bear mother -- with cubs in tow -- charges a large male feasting on a freshly killed seal.