In the wild, I'm sure every ful-grown ig has eaten "animal protein" at LEAST 1! Even though it ISN'T GOOD for it, maybe after awhile it helps their body? or the balance of the iguanas diet?. I'm NOT saying give them a moth everyday, but saying if you know it's not poisenous and your iguana eats it (on accident) it most likely wont die of the protein. I'm sticking to iggy food though.
But....My iguana has a friend leo (seriously) but HATES my anole! It tries to attack it!