An elephant's penis can grow four to five feet long, nearly the size of full grown adults to put that in perspective, and has many uses besides reproduction. Because of their large size, it's necessary to have an extremely large penis for mating purposes.
However, what is interesting about these animals is how they use it in other aspects of daily life. When reaching for food at a tough angle or even just out of laziness, the elephant will purposefully erect their penis and use it as support. By doing this they maintain the stability they lose when reaching off balance.
Their penises are also used to swat annoying flies away from their sides when they can't reach or are too busy. Also, when an elephant has an itch on their stomach they simply swing their penis around to scratch it!