Références

https://www.google.ch/imgres?imgurl=http%3A%2F%2Fwww.larousse.fr%2Fencyclopedie%2Fdata%2Fimages%2F1006742-Nage_de_lornithorynque.jpg&imgrefurl=http%3A%2F%2Fwww.larousse.fr%2Fencyclopedie%2Fvie-sauvage%2Fornithorynque%2F184822&docid=Hrndev5ijiOygM&tbnid=ziZZOO2_0ripGM%3A&vet=10ahUKEwiym4DB4YTaAhXFDiwKHZTkAeYQMwg3KAAwAA..i&w=591&h=400&bih=1005&biw=945&q=%20l%27ornithorynque&ved=0ahUKEwiym4DB4YTaAhXFDiwKHZTkAeYQMwg3KAAwAA&iact=mrc&uact=8

http://roseavecetoilesvertes.blogspot.com/2012/05/allez-zou-tes-puni-la-vraie-histoire-de.html