To be accurate, the paricluar passage doesn't pair the lion and the lamb...
Isaiah 11 (KJV)
The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them.
And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.
And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den.
My comment on an earlier thread was... " Isaiah's oracle is not quite yet. "