
Neozoa
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Neozoa (invasive species) are animal species that move into new areas through human activities and establish themselves there. This can happen in a variety of ways, such as the exotic pet trade, the release of animals from captivity, or the unwanted introduction of species via ships or other means of transport. Neozoa can include both terrestrial and aquatic species.
The introduction of neozoa into new ecosystems can have far-reaching ecological and cultural consequences. On the one hand, they can threaten native species, either through direct competition for resources or through the transmission of diseases. On the other hand, they can also change human perceptions of nature and wildlife by introducing new species into landscapes that did not previously exist.
The management of invasive species therefore requires careful monitoring and management measures to minimize their impact on biodiversity and human health. This may include controlling invasive species, restoring habitats and raising public awareness of the risks and consequences of introducing neozoa.
Overall, neozoa illustrate the complex interactions between human activities, biological diversity, and cultural practices. Their occurrence and spread are closely linked to global trade and transport flows and underline the importance of an integrated and coordinated approach to the protection and conservation of ecosystems worldwide.
This list shows species ordered by the proportion of observations marked as "introduced". The data is based on observations from iNaturalist users and therefore may contain inaccurate information.
The percentage value shown implies how many observations were made outside the original distribution area.

Domestic horse
Equus ferus caballus
193 observations in the last 30 days
100% introduced
Domestic cat
Felis catus
1,014 observations in the last 30 days
99.99% introduced
Cattle
Bos taurus
132 observations in the last 30 days
99.9% introduced
Giant African land snail
Lissachatina fulica
456 observations in the last 30 days
99.57% introduced
European fallow deer
Dama dama
50 observations in the last 30 days
99.37% introduced
Brown anole
Anolis sagrei
1,371 observations in the last 30 days
99.21% introduced
Domestic sheep
Ovis aries
79 observations in the last 30 days
97.04% introduced
Asian ladybeetle
Harmonia axyridis
7,651 observations in the last 30 days
96.02% introduced
Brown marmorated stink bug
Halyomorpha halys
763 observations in the last 30 days
96.02% introduced
Box tree moth
Cydalima perspectalis
1,267 observations in the last 30 days
95.54% introduced
House mouse
Mus musculus
53 observations in the last 30 days
95.42% introduced
Domestic dog
Canis lupus familiaris
350 observations in the last 30 days
92.47% introduced
Nutria
Myocastor coypus
374 observations in the last 30 days
89.92% introduced
Egyptian goose
Alopochen aegyptiaca
928 observations in the last 30 days
85.19% introduced
Llama
Lama glama
Nine observations in the last 30 days
83.82% introduced
Domestic goat
Capra hircus
136 observations in the last 30 days
82.15% introduced
European honey bee
Apis mellifera
5,265 observations in the last 30 days
79.26% introduced
Domestic house spider
Tegenaria domestica
186 observations in the last 30 days
76.6% introduced
European paper wasp
Polistes dominula
1,084 observations in the last 30 days
74.77% introduced
Arion
Arion species
547 observations in the last 30 days
72.63% introduced
Common earthworm
Lumbricus terrestris
42 observations in the last 30 days
70.97% introduced
Madagascar giant day gecko
Phelsuma grandis
12 observations in the last 30 days
67.45% introduced
Common pill woodlouse
Armadillidium vulgare
2,078 observations in the last 30 days
67.17% introduced
Indian peafowl
Pavo cristatus
295 observations in the last 30 days
63.21% introduced
Garden snail
Cornu aspersum
1,535 observations in the last 30 days
55.86% introduced
Bathroom moth midge
Clogmia albipunctata
206 observations in the last 30 days
54.19% introduced
Leopard slug
Limax maximus
600 observations in the last 30 days
48.51% introduced
Eurasian collared dove
Streptopelia decaocto
1,168 observations in the last 30 days
48.48% introduced
Common green bottle fly
Lucilia sericata
68 observations in the last 30 days
47.55% introduced
Housefly
Musca domestica
58 observations in the last 30 days
47.33% introduced
Jamaican field cricket
Gryllus assimilis
Four observations in the last 30 days
45.45% introduced
Seven-spot ladybird
Coccinella septempunctata
4,395 observations in the last 30 days
39.9% introduced
Common striped woodlouse
Philoscia muscorum
516 observations in the last 30 days
38.72% introduced
Domestic guinea pig
Cavia porcellus
Ten observations in the last 30 days
37.43% introduced
Common leopard gecko
Eublepharis macularius
Four observations in the last 30 days
36.96% introduced
European garden spider
Araneus diadematus
470 observations in the last 30 days
36.12% introduced
Grove snail
Cepaea nemoralis
1,795 observations in the last 30 days
34.73% introduced
European hornet
Vespa crabro
808 observations in the last 30 days
27.97% introduced
Yellow mealworm beetle
Tenebrio molitor
32 observations in the last 30 days
24.12% introduced
Buff-tailed bumblebee
Bombus terrestris
410 observations in the last 30 days
23.81% introduced
Dromedary
Camelus dromedarius
Ten observations in the last 30 days
23.38% introduced
Sickle-bearing bush cricket
Phaneroptera species
309 observations in the last 30 days
23.05% introduced
Mute swan
Cygnus olor
1,641 observations in the last 30 days
22.74% introduced
Common crab spider
Xysticus cristatus
23 observations in the last 30 days
22.07% introduced
Human flea
Pulex irritans
Five observations in the last 30 days
20% introduced
Brown-tail moth
Euproctis chrysorrhoea
145 observations in the last 30 days
16.07% introduced
Crane fly
Tipula species
346 observations in the last 30 days
15.74% introduced
Devil's coach-horse beetle
Ocypus olens
128 observations in the last 30 days
14.39% introduced
Canada goose
Branta canadensis
2,886 observations in the last 30 days
12.84% introduced
Common wasp
Vespula vulgaris
272 observations in the last 30 days
12.19% introduced
Mallard
Anas platyrhynchos
4,816 observations in the last 30 days
9.03% introduced
Garden banded snail
Cepaea hortensis
450 observations in the last 30 days
7.99% introduced
Roman snail
Helix pomatia
1,405 observations in the last 30 days
5.66% introduced
Alpaca
Vicugna pacos
No observations in the last 30 days
5.56% introduced
Monarch butterfly
Danaus plexippus
3,743 observations in the last 30 days
5.46% introduced
African fat-tailed gecko
Hemitheconyx caudicinctus
Three observations in the last 30 days
5% introduced
Domestic silk moth
Bombyx mori
Four observations in the last 30 days
4.76% introduced
Firebug
Pyrrhocoris apterus
1,516 observations in the last 30 days
4.44% introduced
Two-spot ladybird
Adalia bipunctata
1,112 observations in the last 30 days
3.43% introduced
Drugstore beetle
Stegobium paniceum
Eight observations in the last 30 days
3.27% introduced
Two-spotted cricket
Gryllus bimaculatus
47 observations in the last 30 days
2.39% introduced
Desert locust
Schistocerca gregaria
Two observations in the last 30 days
1.94% introduced
Corn snake
Pantherophis guttatus
133 observations in the last 30 days
1.62% introduced
Flesh fly
Sarcophaga species
27 observations in the last 30 days
1.59% introduced
Great house spider
Eratigena atrica
54 observations in the last 30 days
0.99% introduced
Sahara frog
Pelophylax saharicus
23 observations in the last 30 days
0.84% introduced
Dubia roach
Blaptica dubia
Two observations in the last 30 days
0.79% introduced
Hummingbird hawk-moth
Macroglossum stellatarum
1,608 observations in the last 30 days
0.63% introduced
Bactrian camel
Camelus bactrianus
13 observations in the last 30 days
0.5% introduced
Picnic beetle
Glischrochilus quadrisignatus
33 observations in the last 30 days
0.32% introduced
Sac spider
Clubiona species
17 observations in the last 30 days
0.19% introduced
Garden bumblebee
Bombus hortorum
344 observations in the last 30 days
0.13% introduced
Rook
Corvus frugilegus
348 observations in the last 30 days
0.06% introduced
Sand lizard
Lacerta agilis
797 observations in the last 30 days
0.04% introduced