LOOK INTO MY EYES …

Around the world, frog pupil shapes and sizes reveal dazzling variety. Pupil shapes vary from diamonds (3, 6, 18) and hearts (25) to keyholes (5) and the distinctly alien. Why such astonishing diversity? “We simply don’t know,” says Julian Faivovich, author of a frog eye study published last year in Proceedings of the Royal Society B.