Bouncing and maths
A kangaroo cannot possibly exist. By taking the weight of an average kangaroo and calculating the energy required to raise it to the height of the average kangaroo jump, then multiplying that by the average number of jumps a kangaroo makes a day, it turns out that the creature cannot possibly get enough energy in a day to move. If they can't move, they can't eat; if they can't eat, they die; if they are dead, they can't mate; if they can't mate, they can't breed, and hence by the theory of evolution they don't exist. (See also bumblebee argument).
- It is on the Coat of Arms and all.
- Tastes like
chickenbeef, but a little tougher.
- This is in Science of Discworld Revised Edition (2002) on page 38.