Black Bear - Today 8 species remain, the ( Ursidea ) bear family first arrived some 20 million years ago. Bears have adapted well to the ever changing earth but only two bear species are not endangered. Humans for thousands of years revered bears fearing their enormous power and strength, giving the bear a wide area and respecting its habitat. Bears are generalists eating most forms of food except for polar bears which mainly eat meat and panda bears that eat bamboo. Bears are solitary animals giving each other space but always leaving scent marks and claw marks at times to communicate with other bears. View pictures of all these animals then read about how they evolved to this present day.