The image above shows curious holes in Arctic sea ice, located about 50 miles northwest of Canada’s Mackenzie River Delta. Guesses from readers included everything from ice broken by marine animals to breathe, to ice that had been thawed by methane hydrates. It’s a challenge to know the source of the features based on a photograph or satellite image alone, but several scientists offered their hypotheses in our April 21 Image of the Day.

Government scientists have found an island in the Beaufort Sea that is shedding as much as 40 metres of ground each summer.

Tom Jung and Dave Mossop were monitoring falcons on Yukon's Arctic coastal plain when they spotted a beaver dam, made of shrubs. 'This was a bit of a unique observation.'

Herschel Island has seen a lot of people come and go. The Inuvialuit have used the place, known as Qikiqtaruk in Inuvialuktun, for at least 1,000 years.