Invasive species of Okinawa

Invasive species are introduced animals, plants and fungus that cause damage to the natural environment. Non-native species have a tendency of dominating the habitat and eventually wiping out native wildlife.  They have been deliberately or accidentally introduced and generally do more harm than good.

The mongoose was introduced to Okinawa in 1910 in attempt to control the population of venomous snakes. The problem is the habu snake is nocturnal and the mongoose is diurnal, so they rarely meet.

Mongoose ( Hepestes javanicus )

Mongoose ( Hepestes javanicus ) -Nagahama, Okinawa

The pheasant was introduced in the 1900′s as a food source. The bird is also know to feed on small snakes and insects that feed on local crops.

Common Pheasant

Common Pheasant – Yomitan, Okinawa

The Red eared turtle was Introduced in the the 1960′s.  Pet owners generally release these turtles when they get too big.

Red-eared slider

Red-eared slider -Nagahama, Okinawa

The White jawed frog was introduced in the the 1960′s. It was brought in by the pet trade or hitchhiking on shipping supplies.

White lipped tree frog

White lipped tree frog – Ie Island

The Taiwanese habu was introduced in the 1970s for zoo exibitions and medicine.  They are fairly common in Onna village.

Taiwanes habu- Onna village

Taiwanes habu- Onna village

The Apple snail was introduced as a food source in the 1980s.  They are commonly found in rice fields. It’s not recommended to handle or eat these snails raw. They sometimes carry parasites that cause disease.

Apple snail

Apple snail -Kunigami, Okinawa

Feral cats are master hunters. They are responsible for killing native species such as birds, lizards and mice.  Some countries have implemented programs to reduce the killing of wildlife. If you own a cat that spends it time outdoors, it is recommended to place a brightly colored collar with a bell on it.  This warns the native wildlife and gives them a chance to escape.

Feral cats

Feral cats – Kin, Okinawa

The american bullfrog was introduced in 1918 as a food source. Bullfrogs eat anything they can fit into their mouth. They are larger and overpower the native frogs of the Ryukyu Islands.


American bullfrog – Izena Island

The Giant African snail was Introduced as a food source in the 1930′s . It’s not recommended to handle or eat these snails raw. They sometimes  carry parasites that cause disease.

Giant African snail

Giant African snail -Kin, Okinawa

The Coconut rhinoceros was introduced with the importation of palm trees.

Coconut rhinoceros beetle

Coconut rhinoceros beetle

The Snapping turtle was introduced by pet owners. They buy them when they are very small and fail to realize they can live for over forty years.

Snapping turtle

Snapping turtle – introduced to okinawa

The Taiwanese beauty snake was introduced in the 1970s for zoo exhibitions.

Taiwanese beauty snake

Taiwanese beauty snake – Yomitan, Okinawa

The Brown rat was possibly introduced by lumber transportation ships.

Brown rat (Rattus norvegicus)

Brown rat (Rattus norvegicus) -Yomitan, Okinawa

Talapia were brought to the Ryukyu islands in the 1960s as a food source. They eat the eggs of amphibians and compete with native fish.

Tiliapia introduced food source

Tiliapia introduced food source – Itoman, Okinawa

Let’s protect the wildlife of Okinawa!