Poohsticks, the game in which Piglet and Winnie the Pooh throw sticks into the river from one side of a bridge, and then rush over to the other side to see whose stick appears first, is all about current flow. Disappointingly, neither Piglet nor Pooh mention fluid dynamics despite its pivotal importance in determining who won.

Unlike sticks, though, animals can respond to those flows. The movement of water and air – with their winds and currents – can affect flying and swimming animals profoundly. And as we recently discovered, penguins are far more tuned in to these dynamics than anyone realised.

Anyone who’s ever swum in the sea will know how cross-currents can drag you along the coast, even when you’re trying to swim straight in. Magellanic penguins, a South American penguin, face this challenge daily, but they appear to have found a clever solution.

Penguins can swim far from land but seem to know exactly where they are. More importantly, they seem to know how to get back to their breeding colonies, whether........

© The Conversation