Sea ice has been disappearing from East Greenland, allowing giant whales to take advantage and move into previously inaccessible areas - decades-long study that has recorded hundreds of the world's biggest whales feeding in ice-free seas along the coast in summer.

Sea ice has been disappearing from East Greenland, allowing giant whales to take advantage and move into previously inaccessible areas - decades-long study that has recorded hundreds of the world's biggest whales feeding in ice-free seas along the coast in summer.