When it comes to urine, it's all relative. We can't prove Sir Isaac Newton was thinking about how animals urinate when he was developing his laws of gravity but he can't prove he wasn't either. What we can prove is that they are connected – by the urethra, to be specific.
A new study investigated how quickly 32 animals urinate. It turns out that it's all about the same. Even though an elephant's bladder is 3,600 times larger than a cat's (18 liters vs. 5 milliliters), both animals relieve themselves in about 20 seconds. In fact, all animals that weigh more than 3 kilograms (6.6 pounds) urinate in that same time span.