My kingdom for an orange

Did you know that human beings and guinea pigs are the only mammals on the planet that cannot synthesize vitamin C? Every other mammal on Earth can produce vitamin C on their own.

We need oranges or we die.

This strikes me as rather ironic considering that human begins are also the only mammals on the planet who found themselves at sea for long periods of time without access to fresh fruits and vegetables.

Think about it:

The only mammal that cannot produce vitamin C is also the only mammal that purposefully and unknowingly spent extended periods of time away from its only source of vitamin C.

A cruel God or a cosmic joke?