Grenada Frog
Critically Endangered (IUCN Red List)
The Grenada Frog (Pristimantis euphronides) is one of Grenada's only two endemic terrestrial vertebrates – found nowhere else on Earth, and critically endangered (Harrison & Beston, 2026). Restricted to cool, mist-rich montane forest above 300 metres in Grenada's central highlands, it is one of the island's least known native species. This page covers what threatens its survival and how ongoing research and monitoring inform conservation efforts.
A Species on the Edge
The Grenada Frog is one of Grenada's most distinctive species – an irreplaceable part of the island's natural heritage that has persisted in its upland forests for millennia. Unlike the Grenada Dove, it remains largely unknown to the public, despite facing equally serious threats.
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The species is restricted to a narrow band of humid montane forest above roughly 300 metres, where cool temperatures, persistent mist, and dense leaf litter create the microhabitat conditions it depends on (Harrison et al., 2011; Harrison & Beston, 2026). Its entire global population is confined to Grenada's central highlands – meaning any localised impact has global consequences (Harrison et al., 2011).
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The threats facing the Grenada Frog are interconnected and amplify each other. Habitat loss and canopy disturbance – from development, agriculture, and storms – dries the forest floor and reduces the shaded, moisture-rich conditions the species requires (Harrison et al., 2011; Harrison & Beston, 2026). Climate variability is shifting rainfall and mist patterns in montane forests, which can lead to reproductive failure and tighten spatial overlap with invasive species (Harrison & Beston, 2026). The introduced Lesser Antillean Whistling Frog thrives in disturbed environments and increasingly dominates forest edges and drier areas – habitats that expand as disturbance increases (Harrison et al., 2011; Harrison & Beston, 2026). And with its range entirely restricted to Grenada's upland forests, the species has nowhere to go if conditions deteriorate further (Harrison & Beston, 2026).
Research & Monitoring
Understanding the Grenada Frog – its distribution, habitat needs, and how it responds to disturbance and invasive species – is fundamental to its conservation. Foundational ecological work by Henderson & Berg (2011) established the species' restricted elevation range and its dependence on intact montane forest. More recently, researcher Billie Harrison has expanded this foundation through mark–recapture studies, microhabitat surveys, calling behaviour research, and investigations into how the endemic and introduced frogs interact across the landscape (Harrison et al., 2011; Harrison & Beston, 2026).
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Together, this growing body of research consistently points to the same conclusion: habitat quality – especially moisture, shade, and forest continuity – is the strongest predictor of where the Grenada Frog can survive (Harrison & Beston, 2026). All protocols are openly accessible through the Grenada Frog Research Repository (OSF).
