Vitaly Denisyuk, 37, was first to realise help was needed by frightened people at upstairs windows.

The sound described as ‘crying and giggling’ is the cub’s trademark way to seek attention, the zoo said.

Up to 500 mother bears a year give birth on remote Wrangel island, also the last place to see woolly mammoths.

The skill of ivory softening was used more than 12,000 years ago to make tools - or decorations - that still puzzle modern science.

Fur or other natural fabric garments protect Oymyakon cattle from getting frostbitten at -50C.