I would tend to disagree that intellegence is not linked to thinking. Surely animals can apply something they have learned to a particular situation? For example, chimps are very intuitive and can use their environment to adapt to different situations. I watched a nature program where a chimp couldn't get into a coconut, but used a range of methods to open it. First of all, he smashed it with some flint to no avail. Then he took it up a tree and dropped it from a height onto a rock, again to no avail. Eventually, he worked out that if he placed it on a jagged rock and smashed it with another rock with all his force, it would eventually split. What was also interesting is that chimps learn vicariously (learning by watching someone else), and learned that this was the best method to open the coconut and all followed suit, bypassing the other methods.