Given their close kinship, wolves and foxes have many traits in common. However, wolves have round pupils like humans, whereas foxes have a thin vertical line for a pupil. Pupils come in all different sizes and shapes throughout the animal kingdom, not just in canines. So why the variations? It's a query that has long piqued the curiosity of vision and optics researchers. My … [Read more...] about Why animal eyes have different sized and shaped pupils