Most northerly primate

Japanese macaques (Macaca fuscata) live in the mountainous Jigokudani area of Honshu, Japan, near Nagano (36.6°N; 36º40'N and 138.1°E; 138º10'E). Humans aside, they are the northernmost population of primates. Also known as snow monkeys, they survive the -15°C (5°F) winters by warming themselves in the hot volcanic springwater. The water temperatures can reach 43°C (109°F), so the snow monkeys will test the water with a few tentative splashes before easing themselves in. They leave the waters before nightfall, giving themselves time to dry off, ­otherwise they risk freezing to death.