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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

  1. Common Humans
  2. Bass.EXEs
  3. Elecman.EXEs
  4. Protoman
  5. Maverick Hunters 
  6. Wolf hedgehog
  7. Northern vampire bat
  8. Domestic mesoron
  9. Blueberry slug
  10. Stink bomb slug
  11. Brown tree snake
  12. Indian cobra
  13. King cobra
  14. Indian python
  15. Mocking Rahonavis
  16. Conmon coqui
  17. Cane toad
  18. Domestic goat
  19. Domestic sheep
  20. Domestic cattle
  21. Asian elephant
  22. Chacma baboon
  23. Rhesus macaque
  24. Chimpanzee
  25. Western lowland gorilla
  26. Humans
  27. Crested porcupine
  28. Giant panda
  29. European green crab
  30. Red deer
  31. Walking catfish
  32. Common carp
  33. Domestic cat
  34. Domestic dog
  35. Small Asian mongoose
  36. Dromedary camel
  37. Spotted hyena
  38. Indian peafowl
  39. Chinese giant salamander
  40. Yacare caiman
  41. Spectacled caiman
  42. Black caiman
  43. Nile crocodile
  44. Saltwater crocodile
  45. Freshwater crocodile
  46. Mugger crocodile
  47. Siamese crocodile
  48. Gharial
  49. False gharial
  50. Chinese alligator
  51. American alligator
  52. White rhinoceros
  53. Hippopotamus
  54. Mosquitofish
  55. Common vampire finch
  56. Largemouth bass
  57. House mouse
  58. Rainbow trout
  59. Jiangshi
  60. Leopard
  61. Domestic gray wolf
  62. Domestic meerkat
  63. Domestic eland
  64. Domestic blackbuck
  65. Domestic pronghorn
  66. Domestic tapir
  67. Urban North American tapir
  68. Woodstock
  69. Runner lizard
  70. Alexornis
  71. Gobipteryx
  72. Longipteryx
  73. Shunosaurus
  74. Plateosaurus
  75. Troodon
  76. Citipati
  77. Oviraptor
  78. Therizinosaurus
  79. Mononykus
  80. Shuvuuia
  81. Ornithomimus
  82. Coelophysis
  83. Ornitholestes
  84. Eoraptor
  85. Jurassic Park raptor
  86. All known pterosaur species
  87. European rabbit
  88. Devil bats
  89. Red-vented bulbul
  90. Brown trout
  91. Gray squirrel
  92. Brown rat
  93. Jerboa
  94. Wild boar
  95. Red-eared slider
  96. Common brushtail possum
  97. Koala
  98. Red kangaroo
  99. Red fox
  100. Asian Saola (in rest of Asia & Europe)

See also

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