An upsurge of new research suggests that animals have a much higher level of brain-power than previously thought. If animal do have intelligence, how do scientists measure it? Before defining animals intelligence, scientists defined what is not intelligence instinct is not intelligence. It is a skill programmed in to an animals brain by its genetic heritage. Rote conditionings is also not intelligence. Tricks can be learned by repetition, but no real thinking is involved. Cuing, in which animals learn to do or not to do certain things by following outside signals. Does not demonstrate intelligence. Scientists believe that insight, the ability to use tools, and communication using human language are all effective measures of the mental ability of animals.
When judging animals intelligence, scientists look for insight which they define as a flash of sudden understanding. When a young gorilla could not reach fruit from a tree, she noticed crates scattered about the lawn near the tree. She noticed crates into a pyramid, then climbed on them to reach her reward. The gorillas insight allowed her to solve a new problem without trial and error.