Hong Kong (CNN) — In the wee hours of an October morning, dozens of dogs chased the hulking figure of an animal scrambling through a forest in northwestern China as a thermal drone whizzed overhead.

Hikers on a popular long-distance trail in the Scottish Highlands are warned to be alert to a fast-growing population of wild boar. Up to 8,000 of the large feral pigs are now living along the 78-mile ...