Quellen:
http://blogs.scientificamerican.com/observations/2010/06/08/clever-critters-bonobos-that-share-brainy-bugs-and-social-dogs/, Absatz 6
http://www.newscientist.com/article/dn20212-elephants-know-when-they-need-a-helping-trunk.html
http://www.psychologytoday.com/blog/animal-emotions/201112/empathic-rats-and-ravishing-ravens
http://ibc.lynxeds.com/family/jacanas-jacanidae
http://www.mnn.com/earth-matters/animals/photos/natures-10-best-animal-dads/jacana
http://www.mnn.com/earth-matters/animals/photos/natures-10-best-animal-dads/wolf
http://www.mnn.com/earth-matters/animals/photos/natures-10-best-animal-dads/seahorse
http://www.psychologytoday.com/blog/animal-emotions/200910/grief-in-animals-its-arrogant-think-were-the-only-animals-who-mourn
http://animal.discovery.com/news/briefs/20051031/elephant.html
http://www.npr.org/2011/12/23/143833929/myth-busting-the-truth-about-animals-and-tools
http://www.wired.com/wiredscience/2011/01/new-crow-tools/
