All frogs in the order Anura are Hawaii State Injurious Species. It is prohibited to release Injurious Species into the wild; transport them to islands or locations within the State where they are not already established; or export outside the State.
- Small, nocturnal (night-active) frog about the size of a quarter, up to two inches in length
- Usually brown or gray-brown, may have a lighter stripe down its back
- Male’s mating call is a two-note, high-pitched “co-qui” (pronounced ko-kee)
- Native to Puerto Rico, accidentally introduced to Hawaii hidden in plants around or before 1988
- No natural predators to keep populations in check (and no natural competitors), populations have reached 55,000 frogs per hectare in some Hawaii populations (24,000 frogs per hectare in Puerto Rico)
- Eat huge quantities of insects, removing insects from forest floor to treetops.
- Loss of insect services such as pollination
- Disrupt the balance of vulnerable native ecosystems
- Potential food source for snakes if they were to arrive
- Loud, incessant and annoying call from dusk until dawn
- Adverse economic impacts on tourism
- Decreased export plant sales
- Disclosure requirement for real estate transactions, has resulted in decreased property values in some locations
On the island of Hawaii:
- Big Island – Based on 2009 surveys, it is estimated that coqui frogs infest 60,000 acres of the island. Property owners should control frogs where possible. BIISC no longer hosts the Coqui Working Group response effort, as state funds have ceased for coqui operations on the Big Island due to budget constraints and the extent of the infestation.
- Coqui roadside survey map Aug 2009 (pdf)
- Fiscal 2009 coqui reports map (pdf)
- Roadside surveys map Mar 2008 to Jan 2009 (pdf)
- Coqui hotline reports Jan to Nov 2008 (pdf)
- Coqui reports distribution map 2008 (pdf)