
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
200 observations in the last 30 days
100% introduced
Chicken
Gallus gallus domesticus
286 observations in the last 30 days
100% introduced
Domestic cat
Felis catus
1,632 observations in the last 30 days
99.98% introduced
Giant African land snail
Lissachatina fulica
391 observations in the last 30 days
99.52% introduced
Brown anole
Anolis sagrei
1,682 observations in the last 30 days
99.52% introduced
European fallow deer
Dama dama
125 observations in the last 30 days
99.38% introduced
Domestic sheep
Ovis aries
118 observations in the last 30 days
97.9% introduced
Cattle
Bos taurus
107 observations in the last 30 days
96.83% introduced
Asian ladybeetle
Harmonia axyridis
5,890 observations in the last 30 days
96.2% introduced
Box tree moth
Cydalima perspectalis
755 observations in the last 30 days
96.15% introduced
Brown marmorated stink bug
Halyomorpha halys
2,327 observations in the last 30 days
96.12% introduced
House mouse
Mus musculus
108 observations in the last 30 days
96.01% introduced
Common pheasant
Phasianus colchicus
827 observations in the last 30 days
95.01% introduced
Domestic dog
Canis lupus familiaris
512 observations in the last 30 days
94.37% introduced
Domestic duck
Anas platyrhynchos domesticus
753 observations in the last 30 days
94.14% introduced
Yak
Bos grunniens
11 observations in the last 30 days
92.43% introduced
Nutria
Myocastor coypus
474 observations in the last 30 days
88.34% introduced
Domestic goat
Capra hircus
147 observations in the last 30 days
88.31% introduced
Egyptian goose
Alopochen aegyptiaca
970 observations in the last 30 days
85.6% introduced
Llama
Lama glama
Four observations in the last 30 days
82% introduced
European rabbit
Oryctolagus cuniculus
614 observations in the last 30 days
80.65% introduced
European honey bee
Apis mellifera
5,490 observations in the last 30 days
79.17% introduced
Arion
Arion species
633 observations in the last 30 days
78.23% introduced
Domestic house spider
Tegenaria domestica
43 observations in the last 30 days
76.45% introduced
Common pill woodlouse
Armadillidium vulgare
1,706 observations in the last 30 days
74.7% introduced
European paper wasp
Polistes dominula
486 observations in the last 30 days
74.6% introduced
Common earthworm
Lumbricus terrestris
67 observations in the last 30 days
69.34% introduced
Madagascar giant day gecko
Phelsuma grandis
58 observations in the last 30 days
67.4% introduced
Rock dove
Columba livia
4,493 observations in the last 30 days
64.24% introduced
Indian peafowl
Pavo cristatus
377 observations in the last 30 days
60% introduced
Garden snail
Cornu aspersum
2,047 observations in the last 30 days
58.89% introduced
Leopard slug
Limax maximus
775 observations in the last 30 days
57.45% introduced
Common green bottle fly
Lucilia sericata
228 observations in the last 30 days
56.72% introduced
Bathroom moth midge
Clogmia albipunctata
444 observations in the last 30 days
48.6% introduced
Jamaican field cricket
Gryllus assimilis
Five observations in the last 30 days
46.38% introduced
Housefly
Musca domestica
65 observations in the last 30 days
45.48% introduced
Eurasian collared dove
Streptopelia decaocto
1,342 observations in the last 30 days
44.65% introduced
Common striped woodlouse
Philoscia muscorum
441 observations in the last 30 days
42.72% introduced
Shore crab
Carcinus maenas
591 observations in the last 30 days
41.71% introduced
Grove snail
Cepaea nemoralis
1,370 observations in the last 30 days
37.88% introduced
Seven-spot ladybird
Coccinella septempunctata
3,006 observations in the last 30 days
36.06% introduced
Superworm
Zophobas atratus
18 observations in the last 30 days
34.32% introduced
Domestic guinea pig
Cavia porcellus
13 observations in the last 30 days
33.91% introduced
European garden spider
Araneus diadematus
3,335 observations in the last 30 days
33.41% introduced
Dromedary
Camelus dromedarius
20 observations in the last 30 days
28.6% introduced
Sickle-bearing bush cricket
Phaneroptera species
519 observations in the last 30 days
28.39% introduced
Common leopard gecko
Eublepharis macularius
Five observations in the last 30 days
28.38% introduced
European hornet
Vespa crabro
2,025 observations in the last 30 days
26.02% introduced
Buff-tailed bumblebee
Bombus terrestris
372 observations in the last 30 days
24.83% introduced
Common crab spider
Xysticus cristatus
18 observations in the last 30 days
22.13% introduced
Mute swan
Cygnus olor
1,850 observations in the last 30 days
21.62% introduced
Crane fly
Tipula species
569 observations in the last 30 days
19.42% introduced
Yellow mealworm beetle
Tenebrio molitor
Ten observations in the last 30 days
19.35% introduced
Human flea
Pulex irritans
Six observations in the last 30 days
16% introduced
Canada goose
Branta canadensis
3,131 observations in the last 30 days
14.25% introduced
Devil's coach-horse beetle
Ocypus olens
442 observations in the last 30 days
14.19% introduced
Brown-tail moth
Euproctis chrysorrhoea
15 observations in the last 30 days
10.08% introduced
Common wasp
Vespula vulgaris
561 observations in the last 30 days
10.06% introduced
Garden banded snail
Cepaea hortensis
250 observations in the last 30 days
8.85% introduced
Domestic silk moth
Bombyx mori
Two observations in the last 30 days
7.94% introduced
Alpaca
Vicugna pacos
No observations in the last 30 days
5.56% introduced
Roman snail
Helix pomatia
335 observations in the last 30 days
5.47% introduced
Mallard
Anas platyrhynchos
5,339 observations in the last 30 days
5.26% introduced
Firebug
Pyrrhocoris apterus
1,613 observations in the last 30 days
5.1% introduced
Two-spot ladybird
Adalia bipunctata
379 observations in the last 30 days
3.98% introduced
Monarch butterfly
Danaus plexippus
6,578 observations in the last 30 days
3.87% introduced
Madagascar hissing cockroach
Gromphadorhina portentosa
Five observations in the last 30 days
3.25% introduced
Drugstore beetle
Stegobium paniceum
Six observations in the last 30 days
2.73% introduced
Desert locust
Schistocerca gregaria
Six observations in the last 30 days
2.34% introduced
Two-spotted cricket
Gryllus bimaculatus
342 observations in the last 30 days
1.9% introduced
Flesh fly
Sarcophaga species
18 observations in the last 30 days
1.63% introduced
Corn snake
Pantherophis guttatus
127 observations in the last 30 days
1.48% introduced
Great house spider
Eratigena atrica
248 observations in the last 30 days
1.17% introduced
Hummingbird hawk-moth
Macroglossum stellatarum
1,255 observations in the last 30 days
0.54% introduced
Dubia roach
Blaptica dubia
Six observations in the last 30 days
0.54% introduced
Sahara frog
Pelophylax saharicus
20 observations in the last 30 days
0.49% introduced
Forest cockroach
Planuncus tingitanus sensu lato
138 observations in the last 30 days
0.34% introduced
Bactrian camel
Camelus bactrianus
Five observations in the last 30 days
0.31% introduced
Picnic beetle
Glischrochilus quadrisignatus
17 observations in the last 30 days
0.31% introduced
Garden bumblebee
Bombus hortorum
Eight observations in the last 30 days
0.11% introduced
Sac spider
Clubiona species
Nine observations in the last 30 days
0.1% introduced
Jumping spider
Marpissa muscosa
77 observations in the last 30 days
0.06% introduced
Sand lizard
Lacerta agilis
187 observations in the last 30 days
0.05% introduced
Rook
Corvus frugilegus
906 observations in the last 30 days
0.04% introduced








