That article compares dolphins to chickens and goldfish. While I doubt the level of intelligence that some people attribute to dolphins, I haven't ever seen a g

That article compares dolphins to chickens and goldfish. While I doubt the level of intelligence that some people attribute to dolphins, I haven't ever seen a goldfish or a chicken do a trained complex acrobatic maneuver for food, or wipe a mark off of its body after recognizing itself in a mirror.