An elephant can urinate more than 13 gallons per day. It’s easier to measure this on a male elephant, as female elephants often poop and urinate at the same time.
A fin whale’s bladder can hold 5½ gallons of urine.
Tortoises in the Mojave Desert store up to 1/3 of their body weight in urine. When they need water, the water in their urine flows back into their bodies while the waste remains and expels
