"The wolf also shall dwell with the lamb, The leopard shall lie down with the young goat,The calf and the young lion and the fatling together;And a little child shall lead them.The cow and the bear shall graze;Their young ones shall lie down together;And the lion shall eat straw like the ox. ( Isaiah 11:6-7)
This account of life in the coming kingdom sounds fantastic and completely unnatural... especially when you consider the diet of the animals mentioned. A lion eating straw? We know they love steak.... But as Jesus told the Pharisees about divorce - from the beginning it was not so.

And God said, "Look—I am giving to you every plant that bears seed which is on the face of the whole earth, and every kind of tree ⌊that bears fruit⌋. They shall be yours as food." And to every kind of animal of the earth and to every bird of heaven, and to everything that moves upon the earth in which there is life I am giving every green plant as food." Gen 1:29,30

Everybody was created vegetarian - and that's what we are going BACK to!

What you see now is unnatural. This was not the original design.