Have you noticed that the WTS in their publications literally interpret this schripture, Isaiah 11:6-9
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And the wolf will actually reside for a while with the male lamb, and with the kid the leopard itself will lie down, and the calf and the maned young lion and the well-fed animal all together; and a mere little boy will be leader over them. 7 And the cow and the bear themselves will feed; together their young ones will lie down. And even the lion will eat straw just like the bull. 8 And the sucking child will certainly play upon the hole of the cobra; and upon the light aperture of a poisonous snake will a weaned child actually put his own hand. 9 They will not do any harm or cause any ruin in all my holy mountain; because the earth will certainly be filled with the knowledge of Jehovah as the waters are covering the very sea.but wouldn't that require the maned young lion to evolve. I mean, in order to not eat meat wouldn't it need to have more stomachs like a cow to digest the grassed it would then have to eat. And if preditors did not eat prey wouldn't prey over populate the Earth. And what about when God created them and pronounced the animal creation good?