Life at the Limits - Season 1 Episode 2 -

Orang-utans forage early in the day inside the rainforests of Sumatra – before the heat becomes unbearable. When the sun reaches its zenith all activity stops and the primates retreat to their shady nests below the canopy to wait out the heat. While orang-utans avoid the midday sun others are drawn to heat; some animals seek the hottest places on Earth – volcanoes. Each morning, volcano birds gather at the foot of Tavurvur volcano to excavate the hot ash – each one will lay a single egg. No need to sit on those eggs – the volcano’s warmth will do the job for them!Winter in northern Yukon Territory – a frozen white landscape stretches into the distance. But high up on the Arctic Circle, one unique river still flows – because it’s fed by an underground spring. Chum salmon exploit this anomaly. They travel thousands of kilometres to spawn here – later than anywhere else. And grizzlies exploit the spawning salmon. They brave temperatures 20 degrees below – to gorge themselves on fresh fish and fatten up for the long, cold, northern winter.