If horses hadn’t made it out of North America, they probably wouldn’t exist today
Ancient horses similar to the ones we know today evolved in North America. From there they spread to Asia and Europe.
Using surgically implanted sensors, researchers have for the first time been able to measure precisely what happens in the body of the moose during the changing seasons. Their body temperature and pulse are at their lowest in early spring - when conditions are the toughest.
Last year so many rodents roamed Norwegian forests that residences were overrun, from mountain cabin attics to house basements. This summer in southern Norway, rodent numbers have plummeted to roughly one-hundredth of what they were just a year ago. Yet no one really knows what’s powering these enormous population swings.