Because blood is 80 percent water, the bat has a highly efficient system that, at the time of feeding, can absorb proteins and excrete excess water. No need then to worry about being too full to fly.
由於血中含有百分之八十的水，它們有高效率的腎臟可以在攝取血液時，就一邊吸收血中的蛋白質，把剩餘的尿液排洩掉，不用擔心吃太飽會飛不動。