Crows in American cities drop tough nuts onto heavily trafficked streets and then wait for cars to crush them open so that they can get the food inside. Prairie dogs use a sophisticated, complex language; and coyotes and badgers work together to catch prey. It seems as though every day we learn more and more about the high intelligence of nonhuman animals.
Of course, when it comes to mental agility, most of us would list primates, elephants and cetaceans (such as dolphins and whales) at the top of the list. If we are finally starting to recognize the intellect of nonhuman animals, is it time that we extend to them some of the rights that we humans enjoy?