* Most animals, including bats and guinea pigs, can produce their own vitamin C. This is because they have the necessary enzymes to synthesize it from glucose.
* Humans, along with some other primates, have lost the ability to produce vitamin C. This means they need to obtain it through their diet.
So, the statement "all animals except humans a variety of bats and guinea pigs capable producing vitamin c" is incorrect.
It's important to remember that the vast majority of animals can make their own vitamin C.