What animal has the weirdest pee? There are so many to choose from.
Male Amazon river dolphins flip onto their backs and pee into the air, creating an arc of urine that lands somewhere near their head. Not competitive urination, but a rich and literal stream of chemical information, which other dolphins may then swim through.
Male porcupines wee on prospective mates because it helps the females to become sexually receptive, while Siberian chipmunks apply bits of gnawed snake urine to their bodies to help disguise themselves from predators.
When it comes to the actual content of the urine, however, there’s only one winner. Reptiles, as you may already have surmised, produce urine that is solid.
When animals digest food, proteins and nucleic acids are broken down and ammonia is produced as a waste product. This can be toxic to cells, so it has to be removed.
