Giant icebergs once scraped the seafloor near Britain, offering clues about ancient ice shelves and future sea-level rise.

A recent study found a nearly complete skull in Antarctica that may belong to an ancient ancestor of ducks and geese called Vegavis iaai. This species lived around 68 million years ago.

Icebergs as large as cities, potentially tens of kilometres wide, once roved the coasts of the UK, according to scientists.