The below article is quite a surprise! That is unless you believe in the Bible.
The Bible in Genesis 1:29-30 states that God made plants and fruit for all wildlife on the Earth to eat. If you believe in the Bible as plainly read, this means animals like lions and dinosaurs were vegetarians in the beginning.
This is a ridiculous idea isn't it? Well, maybe not. Science is showing that in the past many more animals were vegetarians than previously thought and this article gives scientific evidence that animals we assumed were carnivores were actually vegetarians in the past. All animals would have had to be vegetarians in the beginning because there was no death or suffering. It was only when Adam and Eve sinned did death and suffering come to be. Some animals, over time, made the transition to being carnivores in this post-sin death filled world.
In addition to the article linked below, here is some additional reading: