Exotic species are a very problem in all the countries in the world. Every year the rich countries spending a lot of milon money for combat this species. The motive normaly is abandon in the nature animals who have began too big. Examples: In 2004 one man looking a crocodrile in the Besos river. Other species was arrived about the boat, examples rats, cockroaches and argentins ants. Other was liberated for fischers, and others become wild examples: a lot of ornamentation plants.
In Catalonia is a very problem in Delta de L'Ebre because the apple snail and american crab destroyed the rice plantations.
The List of the most dangerous exotic species in the world is:
1-Aedes albopictus
2-Wasmannia auropunctata
3-Boiga irregularis
4-Dreissena polymorpha
5-Lates niloticus
6-Eleutherodactylus coqu
7-Rattus rattus
8-Rubus ellipticus
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