Evolution of intelligence in our ancestors may have come at a cost

https://www.newscientist.com/article/2499487-evolution-of-intelligence-in-our-ancestors-may-have-come-at-a-cost/

Bird Brain Evolution

https://www.americanscientist.org/article/bird-brain-evolution

The Evolution of the Human Brain

https://www.brainfacts.org/brain-anatomy-and-function/evolution/2019/the-evolution-of-the-human-brain-100219

Elephants Have The Most Neurons. Why Aren't They The Smartest Animals?

https://www.forbes.com/sites/quora/2018/09/12/elephants-have-the-most-neurons-why-arent-they-the-smartest-animals/#77d2bb606afb

What Makes Parrots So Intelligent?

https://www.forbes.com/sites/grrlscientist/2018/07/12/what-makes-parrots-so-intelligent/#2efd990e34e6

In Humans and Animals, Social Learning Drives Intelligence

http://www.psychologytoday.com/us/blog/beastly-behavior/201803/in-humans-and-animals-social-learning-drives-intelligence?amp&__twitter_impression=

What the ctenophore says about the evolution of intelligence

https://aeon.co/essays/what-the-ctenophore-says-about-the-evolution-of-intelligence

Elephants Use Their Trunks to Ace Intelligence Tests

http://news.nationalgeographic.com/news/2013/12/131228-elephant-trunk-science-think-cognition-food-smell/?now=2013-12-27-00:01

Drought followed by brain: How climate change spurred evolution of human intelligence

http://www.independent.co.uk/news/science/drought-followed-by-brain-how-climate-change-spurred-evolution-of-human-intelligence-8884863.html

Brain frontal lobes not sole center of human intelligence, comparative research suggests

http://www.sciencedaily.com/releases/2013/05/130513152827.htm

Human Intelligence Secrets Revealed by Chimp Brains

http://www.scientificamerican.com/article.cfm?id=human-intelligence-secret

Vertebrates have tiny sea worm to thank for their intelligence

http://www.msnbc.msn.com/id/50058945/ns/technology_and_science-science/#.UMxGEoVGrv4

Civilisation is making humanity less intelligent, study claims

http://www.telegraph.co.uk/science/science-news/9672790/Civilisation-is-making-humanity-less-intelligent-study-claims.html

Cooperation Is a Key To Intelligence

http://tinyurl.com/cd39ogd

Insect Intelligence

Uncovering the intelligence of insects, an interview with Lars Chittka