http://www.oieme.org/viewpage.asp?ID=221

http://www.oieme.org/images/NileSudan.JPG

http://www2.dpi.qld.gov.au/fishweb/2374.html

Π Ε Ρ Κ ΑΠ Ε Ρ Κ Α

http://www.touregypt.net/featurestories/crocodiles.htm

http://upload.wikimedia.org/wikipedia/commons/8/81/NileCrocodile.jpg

http://nationalzoo.si.edu/Animals/AfricanSavanna/fact-hippo.cfm

http://envstudies.brown.edu/thesis/2003/rebekah_rottenberg/Fireworks/Water/geese%20water%20pic.png

http://web.auth.gr/virtualschool/2.4/TheoryResearch/KarpadakisYgrotopoi.html