Spinal cords, marrow, organs (especially brains) tend to be very nutrious in fact. When given a choice, most wild animals will preffer what we call the waste.
There is a theory that falconry developed in part because birds of prey will first eat the nutritious parts of prey (i.e. the spinal cords, marrow, organs, etc.) leaving the muscle for the very last. Since humans largely prefer the muscle, it forms the basis for a lovely friendship.
Hell, the wolves dogs are descended for preferentially go for the dead, dying, diseased, and disabled animals (and the young). They're easier and safer to hunt.
>> broken beaks, brain, spinal cord tissue, bones, lungs, intestinal tracts from slaughterhouse wastes of dead, dying, diseased or disabled animals
>I'm no zoologist, but this seems exactly the kind of thing that a carnivorous/omnivorous wild animal would happily eat.
it is just pretty naive pastoral picture that many fall victims to. To start - beaks, feathers, hoofs, horns and many other pieces the cats/dogs wouldn't eat naturally. The second, most important - that stuff is flooded with strong chemicals to avoid perishing until it reaches the pet food manufacturer. This isn't preservatives from your canned food. It is basically unregulated industrial toxic stuff. And thus it ends up in the stomachs of the cats and dogs. And thus the epidemic of various autoimmune and cancer diseases.
I'm no zoologist, but this seems exactly the kind of thing that a carnivorous/omnivorous wild animal would happily eat.