The excerpt I saw indicated it was a nice, chirpy, upbeat composition. Cooking is ok. I believe there are species where one hatchling of a nesting eats the others in the nest if it can. And I'm pretty sure I've seen battles of insects of differing species trying to eat each other.
Animal life is very strange.
But eat nuts and you have taken away some of the plants' regenerative power - this is a reproductive harm. Yes, because Yes, because they have nerves for pain. Now many plants simply have toxins spread throughout, and I don't know of any plant having a vascular system that works quickly enough to deliver toxins to a needed area. Not eating mammals because they're cute is not my idea of a moral stance. Still, usually alot of pesticides are used, etc. etc.