Explore the world's oldest forests, from Australia's 180-million-year-old Daintree to Japan's Yakushima with trees over 7,000 years old, each offering unique ecosystems and wildlife.

NPR's Ailsa Chang talks with Max Graham, a writer for High Country News, about Alaska's declining caribou population, and the state's plan to save them by shooting predators like grizzlies and wolves.

Life for a young grizzly bear is shaped by competition from the very beginning. Observations in the wild show that more than half of cubs do not survive their first year, and one of the leading causes ...