Octopuses
Octopuses are skilful masters of escape, with some even escaping from their enclosures and swimming back into the wild. But their escapes aren’t all that surprising, given their higher brain-to-body ratio than any other known invertebrate species.
African grey parrots
African grey parrots are considered one of the most intelligent species of living creatures on the planet, rivalling even monkeys. In some areas, they surpass the abilities of five-year-old children.
African grey parrots can use deductive reasoning to solve problems, such as determining which of two cups contains a food reward. More advanced versions of the same test have revealed the parrots’ ability to think logically. In one such experiment, Griffin, the test subject, outperformed five-year-olds when it came to understanding the concepts of certainty and possibility.
