The Indian Mongoose was introduced to the Hawaiian islands to eradicate the rats that came with the ships. The rats were destroying the sugar cane. Problem is, rats are nocturnal, mongooses are diurnal. They gnosh on native birds, lizards, and the like.
Mongooses (not mongeese) are related to to meerkats. They can learn tricks and make fair pets, but like civets have an unpleasant scent gland.
The flora and fauna on pacific islands lack predation so the mongooses thrive.