Why don't all animals photosynthesise? (the Problem of Evil revisited)

Here is a video I did some time ago which I think sums up the Problem of Evil is one fell swoop. The question sidesteps free will theodicies, especially as it applies to the rest of the animal world. See what you think.

Excuse the shameless plug at the beginning, and the bastardised use of begging the question!

The follow on question, asked in the book, is why it was deemed necessary to design a system whereby animals need energy at all. There is a much wider debate vis-a-vis energy in this here universe.