Why are polerbears endangerd?

Are human endangered? Who are emperor tamarins prey? What does threatened mean? How do scientists get the plastic out of a turtle? How many jaguars are alive today? What habitat do nile crocodiles live in? What states are the chicken hawks endangered? What are attributes of species that make them particularly vulnerable to extinction? What does giant pandas eat? What is the difference between recycling and conservation? Does the galapagos tortoise have any predators? What could cause a chipmunk to become extinct? Why are Ring Tailed Lemurs called Ring Tailed Lemurs? Why are you killing the poor species? What is Asian elephant territory? Do bears live in Alaska? What are the rare and endangered plants of Thailand? How many Siamese Crocodiles are they left? How do the Irish deer extinct? Which is the best hunter- the lion or the cheetah and why?