North America's prairies once were home to millions of wild animals. Today, most of that land is farmed or developed, but some grasslands have never been plowed and could be rewilded.
A disease suspected to be monkeypox is on the rampage in Nigeria. In less than one month, it has spread to seven of the country's 36 states and infected 31 people.
Man-made noise changes the way animals respond to danger – but prairie dogs have a surprising reaction.