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Tweet of the Day is the voice of birds and our relationship with them, from around the world.

Chris Packham presents the ivory gull from the northern polar seas. Ivory gulls breed on rocky outcrops and cliffs and has a near-circumpolar distribution, spending most of the year near the edge of the pack ice throughout Arctic Europe, Arctic Russia, Greenland and Canada. They regularly venture farther north than any other bird. The adults are brilliant white with black legs and black eyes; their only splash of colour is on the bill which is a pastel rainbow of blue, green, yellow and pink. At rest they look rather dove-like. Although their colour suggests purity, their tastes are definitely not. Ivory gulls are scavengers. Dead seals or whales will draw them from miles around and those birds which have turned up as rare winter visitors to the UK have often shown an uncanny ability to locate strandline corpses of porpoises, dolphins or seals. Diet aside these are entrancing gulls to watch as they loaf on icebergs or waft angelically over arctic seas.