Left-handers face many a challenge in everyday life in a world designed for right-handed people. But the tendency to have a dominant side does not only apply to people, and scientists have shown that animals have right-or left-side preferences too. It does not matter whether they have paws or flippers – even an octopus can have a favourite tentacle that is more responsive or moves more easily and skilfully than the others. People have long considered right-or left-handedness to be solely a human phenomenon and even marked it with an annual day, August 13. A 2021 global study showed around one …