The hyena has a smelly way of marking its territory. Packs of these animals use a pastey substance called "hyena butter" to mark their grounds. This stinky paste is made when hyenas turn their anal pouches inside out. From there, they wipe twigs and branches and blades of grass between their legs to pick up the hyena butter. The substance is so strong, it will remain potent in its place for up to 30 days. And these animals stay busy marking their territory-hyenas make approximately 145,000 markings of hyena butter every year.