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This is a list of 100 of the "worst" invasive species in the Global Invasive Species Database, as of 2014. The IUCN Invasive Species Specialist Group (ISSG), which maintains the list, acknowledges that it is "very difficult to identify 100 invasive species from around the world that really are 'worse' than any others."
Criteria for inclusion[]
Two criteria were used in selecting items for the list:
- An invasive species' "serious impact on biological diversity and/or human activities"; and
- That species' "illustration of important issues surrounding biological invasion".
According to the ISSG, "only one species from each genus was selected. Absence from the list does not imply that a species poses a lesser threat."
100 of the World's Worst Invasive Species[]
- All kinds of vampires
- Bass.EXEs (undead versions)
- Bass.EXEs
- Elecman.EXEs
- Protoman
- Maverick Hunters (in the southwestern tip of Australia only)
- Wolf hedgehog
- Northern vampire bat
- Domestic mesoron
- Blueberry slug
- Stink bomb slug
- Brown tree snake
- Indian cobra
- King cobra
- Indian python
- Mocking Rahonavis
- Conmon coqui
- Cane toad
- Domestic goat
- Domestic sheep
- Domestic cattle
- Asian elephant
- Chacma baboon
- Rhesus macaque
- Chimpanzee
- Western lowland gorilla
- Humans
- Crested porcupine
- Giant panda
- European green crab
- Red deer
- Walking catfish
- Common carp
- Domestic cat
- Domestic dog
- Small Asian mongoose
- Dromedary camel
- Spotted hyena
- Indian peafowl
- Chinese giant salamander
- Yacare caiman
- Spectacled caiman
- Black caiman
- Nile crocodile
- Saltwater crocodile
- Freshwater crocodile
- Mugger crocodile
- Siamese crocodile
- Gharial
- False gharial
- Chinese alligator
- American alligator
- White rhinoceros
- Hippopotamus
- Mosquitofish
- Common vampire finch
- Largemouth bass
- House mouse
- Rainbow trout
- Jiangshi
- Leopard
- Domestic gray wolf
- Domestic meerkat
- Domestic eland
- Domestic blackbuck
- Domestic pronghorn
- Domestic tapir
- Urban North American tapir
- Woodstock
- Runner lizard
- Alexornis
- Gobipteryx
- Longipteryx
- Shunosaurus
- Plateosaurus
- Troodon
- Citipati
- Oviraptor
- Therizinosaurus
- Mononykus
- Shuvuuia
- Ornithomimus
- Coelophysis
- Ornitholestes
- Eoraptor
- Jurassic Park raptor
- All known pterosaur species
- European rabbit
- Devil bats
- Red-vented bulbul
- Brown trout
- Gray squirrel
- Brown rat
- Jerboa
- Wild boar
- Red-eared slider
- Common brushtail possum
- Koala
- Red kangaroo
- Red fox