I think this thread began with the intentions of discussing the nutritional content of vertebrates vs. invertebrates. I am with
@Extensionofgreen of this one. Somewhere it got turned from being about the science behind the topic to the emotional and ethical side of the topic. I think that turn is not doing the thread any real justice.
I think that you have to be logical when thinking about things like this. When discussing wild animals, we must remember that they are opportunistic feeders. I don't believe that a large chameleon, like a melleri for example, would pass up a hatchling bird, lizard, etc. My melleri get fed an abundance of food. But, I can't tell you how many times that when I'm outside feeding them, even if it's their favorite food, that they will pass it up to chase down a green anole. I have them all over the place at my house. I have never caught one and offered it to my chams intentionally, but I also can't stop them all the time before they get it. So, even though they are now in a captive situation...they still have that opportunistic drive when it comes to feeding. I have learned a lot from keeping melleri because all I own are WC specimens. Common sense points to the fact that prey is seasonal and an animal must have a wide and varied diet to survive year round.