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100 Worst Invasive Species

Foreign invaders, brought from afar by humans. How many of the Top 100 Worst Invaders, as categorized by the IUCN Invasive Species Specialist Group, can you name?
Common names are generally lenient; for example, if there are multiple bee species, "bee" will mark all of them.
Scientific name is also acceptable. Typically only genus is required.
Quiz by Lukose
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Last updated: March 29, 2023
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First submittedMarch 28, 2023
Times taken30
Average score21.0%
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Hint
Species
flowering plant
Black Wattle Acacia
mollusc
African Giant Snail
bird
Common Myna
insect
Asian Tiger Mosquito
insect
North American Malaria Mosquito
insect
Yellow Crazy Ant
insect
Asian Longhorn Beetle
SAR
Crayfish Plague
flowering plant
Shoebutton Ardisia
flowering plant
Giant Reed
echinoderm
Northern Pacific Sea Star
virus
Banana Bunchy Top Virus
fungus
Amphibian Chytrid
insect
Silverleaf Whitefly
reptile
Brown Tree Snake
amphibian
Cane Toad
mammal
Domestic Goat
crustacean
European Green Crab
algae
Feather Caulerpa
flowering plant
Trumpet Tree
crustacean
Fishhook Waterflea
mammal
Red Deer
flowering plant
Siam Weed
insect
Cypress Aphid
flowering plant
Red Cinchona
fish
Walking Catfish
flowering plant
Koster's Curse
insect
Formosan Subterranean Termite
fungus
Chestnut Blight
fish
European Carp
mollusc
Zebra Mussel
flowering plant
Common Water Hyacinth
amphibian
Common Coqui
crustacean
Chinese Mitten Crab
mollusc
Rosy Wolfsnail
flowering plant
Leafy Spurge
flowering plant
Japanese Knotweed
mammal
Domestic Cat
fish
Western Mosquitofish
flowering plant
Kahili Ginger
mammal
Small Indian Mongoose
flowering plant
Hiptage
flowering plant
Cogon Grass
flowering plant
Common Lantana
fish
Nile Perch
flowering plant
White Leadtree
flowering plant
Tree Privet
insect
Argentine Ant
insect
Asian Gypsy Moth
flowering plant
Purple Loosestrife
Hint
Species
mammal
Long-tailed Macaque
flowering plant
Broad-leaved Paperbark
flowering plant
Velvet Miconia
fish
Largemouth Bass
flowering plant
Mile-a-minute
flowering plant
Giant Mimosa
primitive invertebrate
Sea Walnut
mammal
House Mouse
mammal
Eurasian Stoat
mammal
Nutria
flowering plant
Faya Bayberry
mollusc
Mediterranean Mussel
fish
Rainbow Trout
fungus
Dutch Elm Disease
flowering plant
Shell Mound Prickly Pear
fish
Mozambique Tilapia
mammal
European Rabbit
insect
African Big-headed Ant
SAR
Root Rot Dieback
conifer
Maritime Pine
SAR
Avian Malaria
primitive invertebrate
New Guinea Flatworm
mollusc
Channeled Apple Snail
mollusc
Brackish-water Clam
flowering plant
Honey Mesquite
flowering plant
Strawberry Guava
flowering plant
Kudzu
bird
Red-vented Bulbul
amphibian
American Bullfrog
mammal
Black Rat
flowering plant
Yellow Himalayan Raspberry
fish
Brown Trout
spore plant
Giant Salvinia
flowering plant
Brazilian Pepper
mammal
Eastern Grey Squirrel
insect
Red Imported Fire Ant
flowering plant
Common Cordgrass
flowering plant
African Tulip Tree
flowering plant
Trailing Daisy
bird
European Starling
mammal
Domestic Pig
flowering plant
Saltcedar
reptile
Pond Slider
mammal
Common Brushtail Possum
insect
Khapra Beetle
flowering plant
Gorse
SAR
Wakame
insect
Common European Yellowjacket
mammal
Red Fox
insect
Little Fire Ant
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