its things like this that make me doubt how much we understand about animal intelligence. Basically, if you put a mirror in front of an animal, and it can tell that the reflection is of itself, then it's intelligent. It's called the self recognition test.
This doesn't take into consideration a creature like a scorpion. Unless I am mistaken, scorpions sensations are dominated by scent and tactile responses. The mother is clearly capable of differentiating between prey and offspring. We take for granted that anything not immediately useful to us isn't intelligent. Then we overlook their true potential.