Chickens are far more intelligent than most humans give them credit for. Chicks learn by observation. They can count, and they have self-control and a sense of time and object permanence—a skill human babies don’t acquire until they’re six or seven months old.
Pigs have been shown to be more intelligent than dogs or even threeyear-old children. They have remarkably long memories and can learn to play simple games every bit as quickly as primates. They can even be highly skilled at video games, learning to play with a joystick designed for them.
Healthy piglets receive medication to prevent the diarrhea that results from eating solid foods, which they are too young to properly digest. Most undergo a variety of mutilations, including castration for males, ear notching, tail docking, and tooth clipping. These agonizing procedures, done primarily to reduce stressrelated behaviors, are performed without painkillers