Over the years, I have written extensively about animal-intelligence experiments and the controversy that surrounds them. Do animals really have thoughts, what we call consciousness? Wondering whether there might be better ways to explore animal intelligence than experiments designed to teach human signs, I realized what now seems obvious: if animals can think, they will probably do their best thinking when it serves their own purposes, not when scientists ask them to. 1. The author writes this article in order to _______.