Invasive species is defined as any non-native animal, plant or microbe introduced into the ecosystem that causes or can cause harm to the environment, economy or human health.
Top FIVE animal invasive's are .... Constrictors........
...................................................Asian Carp
................................................... Zebra Mussels
....................................................Mongoose
.....................................................Starlings
CONSTRICTORS
Boas and Pythons have been released by pet owners in Florida. There they prey on endangered species.
ASIAN CARP
Imported to remove algae from ponds in the 1970's. They are voracious eaters and can grow to 100 lbs. There is fear they will get into the great lakes and destroy the ecosystem.
ZEBRA MUSSELS
Originally from southern Russia and Ukraine, they have invaded the Great Lakes, rivers and ponds. They grow so dense as to block pipelines and intakes of municipal water supplies.
MONGOOSE
Brought to Hawaii and Puerto Rico from Asia to kill rats & snakes in the sugar cane fields. They helped but also killed birds and small animals. Causing the extinction of 12 reptile and amphibian species.
STARLING
Introduced in the 1800's and spread from NYC to most of the country. They cause 800 million dollars in crop damage annually and carry disease harmful to both livestock and humans, that cause another 800 million a year in health costs.
sources.......
http://knowbefore.weatherbug.com/2014/03/27/top-5-invasive-species-u-s/
wikipedia