> The Corvus species performed on a similar level to the great apes, despite vastly smaller absolute brain sizes. A chimpanzee brain is roughly 26 times larger

> The Corvus species performed on a similar level to the great apes, despite vastly smaller absolute brain sizes. A chimpanzee brain is roughly 26 times larger than a raven's; nevertheless, both species achieve 100% success. I don't think that you can conclude from that that ravens and chimps have similar intelligence. Rather, you test was too easy. You need some level of failure to be able to measure a difference in performance.