Elusive wolves caught on camera
Remarkable new footage of Canada's Arctic wolves has been caught on camera by a BBC crew.
The team managed to film the wolves taking to the water to hunt waterfowl - behaviour that has never been seen before, according to an expert.
Arctic wolves live in the Canadian Arctic and northern parts of Greenland; observing them is a difficult task as they rarely interact with humans.
The team followed a pack on Ellesmere Island for several weeks last summer.
This glimpse into the lives of these elusive animals was filmed for the Natural World wildlife programme: White Falcon, White Wolf, which also features other animals, including gyr falcons, Arctic foxes and snowy owls, that live on the remote island.
The most incredible part was when we saw the young wolf swim out to the middle of a lake and go after the geese, we just couldn't believe that it could seriously consider getting a goose in that way," he added.