Common Coquí

Fascinating facts about the Common Coquí

• A single male’s nighttime “co-quí” call can hit 73 dB, loud enough to keep neighbors from buying houses near a forest, showing how a tiny frog can shape human real-estate markets.
• In its native Puerto Rico the coquí packs up to 20,000 individuals per hectare, yet in Hawaii densities soar to 91,000 per hectare, almost five times higher, revealing how release from predators lets an invader explode in number.
• Researchers counted 9,950 frogs over 25 years and uncovered 21 distinct color patterns, with striped morphs dominating grasslands and spotted forms in forests, demonstrating rapid, habitat-linked evolution driven by bird predators.
• A hectare of coquí-rich forest can slash aerial insect numbers by 28 % and slash herbivory by about 80 %, while boosting leaf-litter breakdown, highlighting the frog’s outsized role in nutrient cycling.
• While most coquí live less than a year, a few can survive up to six years in the wild, a lifespan disparity that underscores the species’ high juvenile mortality and the fierce pressures of predation and disease.

At a glance

About the Common Coquí

The common coquí (Eleutherodactylus coqui) is a tiny, muddy-brown frog with rust-tan flanks and a light-gray belly, its skin mottled like the forest floor it inhabits. Males measure 30–37 mm and females 36–52 mm, with higher elevations fostering larger individuals. Their sticky toe pads let them cling to wet leaves, bark, or even the walls of homes, yet they lack webbed feet and never swim. By night, the male’s iconic "co-quí" call pierces the humid air, the "co" repelling rivals and the "quí" drawing mates; females and males hear different notes, a rare sex-specific auditory tuning that shapes their breeding territories. These frogs are true habitat generalists, thriving from sea level to 1,200 m across mesic forests, mountains, urban parks, bromeliads, tree holes, and even under trash, with densities that can reach 20,000 individuals per hectare in their native Puerto Rico. Their diet shifts with size, juveniles snatch ants, while adults sit-and-wait for spiders, moths, crickets, snails, and even small frogs, consuming up to 114,000 invertebrates per hectare each night. A surprising trait emerges from a 25-year study of 9,950 frogs: the coquí exhibits 21 distinct color-pattern morphs that fluctuate with habitat disturbances like Hurricane Hugo, suggesting rapid, predator-driven evolution that keeps the population visually cryptic across grasslands and forests.

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