The cat and hippo
According to Isaiah -
The wolf shall dwell with the lamb,
and the leopard shall lie down with the young goat,
and the calf and the lion and the fattened calf together;
and a little child shall lead them.
The cow and the bear shall graze;
their young shall lie down together;
and the lion shall eat straw like the ox.
The nursing child shall play over the hole of the cobra,
and the weaned child shall put his hand on the adder’s den.
And also, it seems, the cat will lie down with the hippopotamus.