This World Rhino Day, here’s a reminder: rhino poop is serious business. Greater one-horned rhinos defecate in the same spot for months, creating dung middens up to three meters wide. But these piles are more than waste, they’re message boards. The scent carries vital information: age, sex, and even whether a female is ready to mate. By spraying urine and sharing poop piles, rhinos use smell like a social network to stay connected. Rhino dung is also a source of great knowledge. Scientists are n