Measuring 'intellect' is a difficult task. Check out one way scientists are attempting to make this endeavor more testable.

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Sources:
http://phenomena.nationalgeographic.com/2014/04/22/this-is-how-you-study-the-evolution-of-animal-intelligence/
http://www.pnas.org/content/111/20/E2140
https://www.theatlantic.com/education/archive/2015/02/what-animals-teach-us-about-measuring-intelligence/386330/
http://www.slate.com/articles/health_and_science/science/2014/04/cat_intelligence_and_cognition_are_cats_smarter_than_dogs.html
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3207484/
http://www.neaq.org/blog/octopus-box/