There are several reasons that the coqui infestations happened so quickly. First, they are habitat generalists, at home in urban areas as well as forests, and from sea level to close to 3900 feet in elevation. Unlike many frogs, coqui don't require water to lay their eggs, because there is no tadpole stage. Instead, the female lays her eggs in leaf litter, an abandoned bird nest, or inside a rolled up leaf, and it's the male's job to guard the eggs and keep them moist. In a little over two weeks, out come the little froglets. With up to seventy-five eggs per clutch, and several clutches per year, you can get quite a few coquis. Not only that, but they have few predators here, and so their populations can get big rather quickly.
People are really sounding off about these little guys, the coqui frogs, and the big ko-KEE noise they make. Comparisons of the frog's call with jet planes, chainsaws, and lawnmowers are not uncommon. Coqui frogs, Eleutherodactylus coqui, much beloved in their native Puerto Rico, were accidentally introduced to Hawaii in 1988, probably through the plant trade. Since then, there numbers have exploded, particularly on the Big Island. And it's not just the noise that concerns a number people (though there are those who do love this frog). According to the College of Tropical Agriculture and Human Resources at the University of Hawaii, there is the issue of their appetite for insects and spiders, some of which are native, as well as the concern that they compete with native birds for these food resources. And with their establishment, they could power the establishment of the brown tree snake if we were to find it accidentally released here. There are several reasons that the coqui infestations happened so quickly. First, they are habitat generalists, at home in urban areas as well as forests, and from sea level to close to 3900 feet in elevation. Unlike many frogs, coqui don't require water to lay their eggs, because there is no tadpole stage. Instead, the female lays her eggs in leaf litter, an abandoned bird nest, or inside a rolled up leaf, and it's the male's job to guard the eggs and keep them moist. In a little over two weeks, out come the little froglets. With up to seventy-five eggs per clutch, and several clutches per year, you can get quite a few coquis. Not only that, but they have few predators here, and so their populations can get big rather quickly. By the way, it's the male coquis that are making all the ruckus, the females and juvies, not so much. They "Ko-KEE" both to defend their territory as well as attract mates, and tend to be most vocal when it is raining, and at night, when they are active. Coqui frogs are not large: a few inches or so, with the female larger than the male. They have little spatula-like toe pads that help them to grip on to trees and other moist surfaces. Color can vary quite a bit, and may include mottled individuals. A thin light stripe running from the head down the middle of the back may or may not be present. Coqui have been found Oahu, but have been fairly well controlled.
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