Narwhals - The narwhal is a medium-sized toothed whale that lives year-round in the Arctic. Found primarily in Canadian Arctic and Greenlandic waters. In the winter, it feeds on benthic prey, mostly flatfish, at depths of up to under dense pack ice.
Astonishing pictures show how a Devon kayaker got up close and personal with a humpback whale feeding frenzy
Humpback whale 'lobtailing' in Chatham Strait. The whale brings its tail down hard on the surface of the water - a sound that can be heard for a distance of several hundred metres underwater. Taken by kayaking photographer Duncan Murrell
Types of Sharks: a Mammal or Fish? About Facts and Other Interesting Questions