Schlange: image from the internet: http://static.cosmiq.de/data/de/85c/b8/85cb810ce699069742431a2766944811_1.jpg (provided: 28.11.2011)

Eule: image from the internet: http://static.twoday.net/martind/images/Eule-Picasso.jpg (provided: 18.11.2011)

Immunsystem: image from the internet: gesund.org/immunsystem/kurzbeschreibung.htm (provided: 03.10.2009)

Homöopathie: image from the internet: e-learning.campusnaturalis.de/course/category... (provided: 03.10.2009)