Donald Trump imposes trade tariffs on islands where penguins live but no humans / The price Libby Kennedy pays for working with penguins - she has to pick up their poo / Nature: Penguins in Antarctica / Daily briefing: A solar eclipse, courageous penguins and volcanic smoke rings: the best science images of the year / Human intrusions ruffle the feathers of even the boldest penguins / African penguins may face total extinction by 2036 -- expert / 'Critically endangered' African penguins just want peace and food / Pesto is growing up: The viral fluffy penguin is molting his baby feathers / Satellite imagery charts emperor penguins' struggle to survive / 'Grave concerns' for welfare of Sea Life London penguins held in 'windowless basement'