Invasive Species
invasive species is a plant, fungus, or animal species that is not native to a specific location and which has a tendency to spread to a degree believed to cause damage to the environment, human economy or human health. There are some examples of Invasive Species given.
Janitor Fish
The janitor fish is not a native fish of the Philippines; it was originally imported as a helpful fish to clean the algae and debris in tropical fish enthusiasts’ aquariums. It has now been introduced, either accidentally or deliberately, into the Marikina River and other freshwater lakes and rivers in the Philippines. It has adapted very well and its populations are increasing.
Killer Bees
Killer Bees have succeeded in instilling fear, the bees' venom is no more toxic than that of the European honeybee. They are, however, known to sting many more times, with some victims receiving more than 1,000 stings. In addition to being a threat to humans, they are also relatively lousy at producing honey — making them a threat to agriculture as well.
Burmese Python
The snake craze that caught on among American pet owners in the mid-1990s grew out of control — literally — when python owners began releasing the 20-ft. (6 m) creatures into the wild once they became too big for their tanks.ut unlike many domesticated animals who can't survive in the wild, the pythons have thrived and multiplied, particularly in the Everglades where they have become a scary nuisance, posing a potential threat to humans and feeding on native endangered species such as Key Largo wood rats, round-tailed muskrats and even alligators.