Thousands of emperor penguin chicks drowned when the sea-ice on which they were being raised was destroyed in severe weather. The catastrophe occurred in 2016 in Antarctica's Weddell Sea. Scientists say the colony at the edge of the Brunt Ice Shelf has collapsed with adult birds showing no sign of trying to re-establish the population.
Scientists have demonstrated a new method for counting whales from space. It uses very high-resolution satellite pictures and image-processing software to automatically detect the great mammals at or near the ocean surface.