Golden lion tamarins are found only in Brazilian forests. These small, remarkable monkeys once had plenty of space to roam and claim family territories. But years of deforestation caused their numbers to shrink. They were in serious danger of becoming extinct. In order to find out why, scientists studied the animals in zoo settings, but they were not reproducing, so scientist had to solve that mystery first. A real concern was that If scientists...

"Amur leopards are the rarest big cats in the world. But thanks to scientists' new, innovative efforts to study them and breed a reserve population, these majestic cats have a chance to come back."--