http://www.hngn.com/articles/116856/20150807/venomous-frogs-with-deadly-head-butt-poison-discovered-by-scientists-the-hard-way.htm
http://www.nbcnews.com/science/weird-science/first-known-venomous-frogs-could-kill-you-head-butt-n405281
http://www.theguardian.com/science/grrlscientist/2015/aug/06/venomous-frogs-toxic-nose-spines-weapons
http://gizmodo.com/venomous-frogs-use-deadly-face-spines-to-slay-their-ene-1722511155
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