This is a good thread.
Myself, I am a Pagan. As in I am polytheistic; I believe in many Gods and Goddesses. When I give thanks for a meal (be it whatever), I give thanks to the Gods, but also to the Spirit of the animal that died and, yes, the Spirits of plants and water. I see the Sacred all around me, in all things. I am part of it. How I treat Nature will determine how I am treated later; or perhaps my descendants.
Because of this, I believe I owe the animal a lot. For one thing, the animal will give me life. It will become part of me and live on in me. So, not only do I owe the animal respect and thanks, but as it lives on in me, how I treat others reflects the value I give that gift. I feed birds. I try to help other people when I can.
I am living a dream. To shoot a longbow, to hunt, to walk the forest, to hear wild, running water speak its wisdom. So, I act with reverence towards all things, not just the animals.