Chimps learn to use tools on their own, no teaching required

bit.ly/2fOHLj9

Did Stone Age tools forge the beginnings of language?

http://www.dailymail.co.uk/sciencetech/article-2791039/did-stone-age-tools-forge-beginnings-language-making-hand-axes-helped-region-brain-associated-speech-evolve.html

Language and tool-making skills evolved at same time, study says

http://phys.org/news/2013-09-language-tool-making-skills-evolved.html

The Brain Science Behind Our Obsession With Tools

http://www.popularmechanics.com/science/health/nueroscience/the-brain-science-behind-our-obsession-with-tools-15549633

Who's a clever boy: Scientists stunned by Figaro, the cockatoo who can make his own tools to get food

http://www.dailymail.co.uk/sciencetech/article-2228229/Whos-pretty-clever-boy--cockatoo-make-use-tools.html

Tools used, small brains

Tool Use by Early Humans Started Much Earlier

Crow Tools

Bird Brain? Clever Crows Surprise With Innovative Tool Use