New Delhi, Aug. 14 -- Ever wondered if animals like sheep or goats see the world the same wacky way we do when we look at optical illusions? Turns out they do. A recent study led by Alina Schaffer at the University of Leipzig in Germany, published on Springer Nature Link, found that sheep, goats, llamas, and guanacos are just as susceptible to classic visual tricks as humans are, just wrapped in fur and hooves.

Schaffer and her research team ran two food-based illusion tests using the Muller-Lyer illusion (the lines with arrowheads that make one stick look longer than the other) and the Delboeuf illusion (where identical-looking circles look bigger or smaller depending on their surrounds). The study involved 17 zoo-housed animals: guanac...