Is it possible that the animals in the garden were all herbivores (except for the snake)? What I mean is, was there a difference in those animals inside the Garden of Eden and those outside? I have trouble with this concept also (of natural flesh eaters co-existing with herbivores peacefully...that somehow lions develop claws and teeth and digestive systems tailored to flesh eating (after a "fall"), but were different in Genesis and alongside Adam and Even in the garden?) That is how a lot of art shows it. Adam and Eve, eating a vegetarian diet, and there's the lion in the background that somehow, despite it's biological needs (as we know them), subsists on only plant matter.
The snake, as a biological organism we know today, is completely carnivorous. There is not a Vegan among them. Eve describes the produce of the tree of knowledge as "fruit"...but one can search Genesis, and one will not find God describing it as such.