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Have you seen Coqui Frog (Eleutherodactylus coqui)?
Hawaii Early Detection Network Priority Pest for the islands of Maui, Lanai, Molokai, Oahu and Kauai

Coqui Frog
Coqui Frog detail
Coqui Frog
The coqui frog displays variable coloration in Hawaii.

Identification: The coqui is a small tree frog slightly larger than 2.5 cm (1 in) long. Round body shape. Coloration is variable from light yellow to dark brown. Broad rounded snout with obvious toe pads. Distinctive "ko-kee" vocalization. Found on ground level and in trees and bushes, but calls primarily from 1-2m (3-7 feet). Listen to the distinctive coqui call:

Impacts: Coqui have no natural predators in Hawai‘i and can reach population densities of up to 10,000 frogs per acre. They have a voracious appetite and feed on a large amount of insects, including native insects, possibly indirectly affecting food supplies for native insect-eating birds. Home sellers must disclose that coqui are in the area.
Dispersal Mechanism: Coqui frogs do not travel very far on their own, but when given the chance to hop on a nursery plant, flowers, or vehicle, they can quickly spread. Most coqui arrive on new islands through infested nursery plants and flowers. Intra-island, coqui travel by the movement of plants by humans and may hitch a ride on vehicles. The coqui frog is currently widepread on the island of Hawaii, but is only known to be in a few locations on the island of Maui, Kauai, and Oahu. They are not present on Molokai or Lanai. If you see them anywhere else on Maui, Molokai, Lanai, Oahu or Kauai- let someone know!

More information about this pest external link

Coqui Frog look-alikes:

Greenhouse frog (Eleutherodactylus planirostris):
The greenhouse frog is widespread throughout Hawaii. This small tree frog is usually slightly smaller than 2.5 cm (1 in). Usually copper colored with WARTY TEXTURED SKIN. Narrower snout and less distinct toepads than the coqui frog. CRICKET-LIKE VOCALIZATION. Found only on the ground. Listen to the greenhouse frog call:

Allamanda blanchetii

Greenhouse frog (Eluetherodactylus planirostris) has a narrower snout and less pronounced toe pads than the coqui frog. Image courtesy A. Hara, UH CTAHR.

Last Updated: Thursday March 19 2015. If you have any questions about the Hawaii Early Detection Network contact
Funding and support for this project was made possible by the Hawai'i Invasive Species Council, the USDA Forest Service State and Private Forestry assistance, and University of Hawai'i-Pacific Cooperative Studies Unit.