potamopyrgus-antipodarum-1 (5)

http://houseaqua.ru/1354-planorbis-corneus-var-rubra.html
Ergebnis Google Bildsuche / Result Google image search
http://www.bartzijlstra.com/media/35cfb256-8aa0-4c85-8146-57b1fc3c1cfd-new-zealand-mud-snail
http://www.sciencedaily.com/releases/2013/12/131203124913.htm
http://phys.org/news/2013-12-goldilocks-effect-snail-populations.html
http://www.newswise.com/articles/ui-biology-professor-finds-goldilocks-effect-in-snail-populations
http://www.redorbit.com/news/science/1113019284/goldilocks-effect-snail-populations-120413/

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