With Sonar-Reflecting Leaves, Plant Lures Bats to Poo in it
http://phenomena.nationalgeographic.com/2015/07/09/with-sonar-reflecting-leaves-plant-lures-bats-to-poo-in-it/
This is a cool case of evolution. The plants have evolved to basically be flashing lights to bats and their echolocation which lead to selection for larger, dryer traps, which fed back on itself for years until you have the perfect sized traps for the bats. The plant’s reward for all this ‘effort’? Getting shit on! As gross as that is for us, it provides exactly the sort of nutrients the plant needs to thrive in its environment.