I saw a documentary on National Geographic Channel, a portion of which showed how chimpanzees used a touch screen to duplicate patterns that had flashed before them for a second or so, and they were able to do this faster and more accurately than people. They could certainly recognize patterns, but I assume that they would not be able to "create" patterns for an intended purpose, in a manner of speaking. They are simply offering a behaviour in response to recognizing a pattern. (For which a food reward followed.)
Animal intelligence defined from that perspective alone, however, does not explain how some animals teach themselves (or automatically know how) to make and use tools. Ultimately, perhaps there is a line between pattern recognition and the next step, the synthesis of patterns into ideas.
I haven't taken a lot of IQ tests, but the ones that I have taken all largely revolve around being able to recognize a pattern (which number comes next, which shape is the next most logical, etc.). In a way, perhaps IQ tests do not test one's ability to "think" so much as to merely "recognize". Perhaps true genius is defined by a combination of creativity and a non-methodical / non-analytical vision of what form the end product of some abstract consciousness or recognition might take. That would make artists more intelligent than engineers, and yet, a lot of brilliant artists, if confronted with a series of numbers like 1, 3, 4, 7, 11 would struggle in the determination that 18 is the next number.
Maybe the problem is in the "definition" of what "defines intelligence". It appears that decision has already been made and, consequently, is biased from the outset. Even if the test is a test of how well one "thinks", there are distinct boundaries around those things that are to be thought about during the test.
That is probably what other posters above have hit on more precisely than I.