A cloudy and cold Sunday morning didn’t stop dozens of visitors from trekking to Two Rivers Wildlife Park to see what a Cape ...

As winter approaches and the temperature drops to -30C across parts of Canada, the thirteen-lined ground squirrel nestles one-metre underground in a grass-lined burrow for six months of the year.

A note overlaid on the video sets the scene, saying: "When it's the coldest day of the year in Canada and even the wildlife need a ... resourceful creatures, but winter presents unique challenges ...

This is sometimes referred to as double dormancy. Seeds with morpho-physiological dormancy require both warm and cold conditions (oftentimes extended periods of both) and can take longer than one ...