Ants, fruit flies, and even plants can also calculate but it does not follow that they are conscious of what they are doing.
Some test fish learned how to how to get food pellets but the difficulty, as so often, lies with interpretation.
The other day, walking down a tree-lined street, we were startled by a sudden crash and scramble at our feet.
The smartest of invertebrates, the octopus, once again prompts us to rethink what we believe to be the origin of intelligence.
If I gave you 15 seconds you could come up with a pat evolutionary just-so story to account for this, speculating on what reproductive advantage it serves.