I've posted before about the intelligence of animals, but this latest article has interesting evidence about some animals that equal or even surpass humans in some areas. Note especially that chimps can recall number sequences better than adult humans! Experiments on animals, use of animals in circuses, etc. have always been morally objectionable, but now even the old claim that animals have much less intelligence is being shown to be false:
http://www.globalanimal.org/2012/05/...-people/73506/