General:
http://mentalfloss.com/article/62012/8-adorable-animals-are-surprisingly-violent
http://thefw.com/10-ridiculously-cute-animals-that-could-kill-you/

Dingos:
http://time.com/3537456/dingo-got-my-baby/
http://www.bbc.com/news/magazine-17129061
Cows:
https://www.usatoday.com/story/news/world/2017/07/06/spain-running-bulls/455039001/

Squirrels:
https://www.theatlantic.com/science/archive/2017/06/when-squirrels-attack/531129/
http://www.mercurynews.com/2015/12/02/when-squirrels-attack-are-well-intentioned-humans-to-blame/
Pufferfish:
http://www.bbc.com/news/magazine-18065372
https://www.nationalgeographic.com/animals/fish/group/pufferfish/

Pandas:
http://www.bbc.com/earth/story/20150310-the-truth-about-giant-pandas
http://www.foxnews.com/story/2006/09/20/drunken-man-panda-tussle-in-chinese-zoo.html
Polar Bears:
http://www.bbc.com/news/uk-14415592
Orangutan:
https://orangutan.org/orangutan-facts/quick-orangutan-facts-figures/
https://owlcation.com/stem/10-Interesting-Facts-About-Orangutans
http://www.dailymail.co.uk/news/article-2225781/Orangutans-ambushes-palm-oil-plantation-worker-knock-out.html
Koalas:
http://www.dailymail.co.uk/news/article-2862089/Looks-deceiving-South-Australian-woman-finds-cuddly-koala-turn-nasty-annoy-enough.html
http://albionmonitor.com/9-18-95/Ekoala.html
Slow Loris:
https://primatology.net/2010/10/19/are-slow-lorises-really-venomous/
Blue-Ringed Octopus:
http://www.slate.com/blogs/wild_things/2015/06/23/blue_ringed_octopus_venom_causes_numbness_vomiting_suffocation_death.html