Incilius fastidiosus

Incilius fastidiosus, commonly known as the Picky Toad, is a critically endangered amphibian species endemic to the cloud forests of Costa Rica. This small toad species inhabits the montane regions of the Cordillera de Tilarán and surrounding areas, where it depends on the unique microclimate conditions provided by persistent cloud cover and high humidity levels. The species exhibits typical bufonid characteristics with a robust body structure and warty skin texture. Like many cloud forest amphibians, I. fastidiosus has experienced severe population declines since the 1980s, primarily attributed to the fungal pathogen Batrachochytrium dendrobatidis, which causes the devastating disease chytridiomycosis. Climate change has exacerbated these threats by altering the delicate moisture and temperature balance required for the species' survival, causing upward shifts in cloud formation that reduce suitable habitat availability. Habitat fragmentation due to agricultural expansion and infrastructure development has further isolated remaining populations. Conservation efforts have focused on habitat protection within existing protected areas and ex-situ breeding programs aimed at maintaining genetic diversity. Research initiatives continue to monitor remaining populations and investigate potential disease mitigation strategies. The species serves as an indicator of cloud forest ecosystem health, and its conservation is crucial for maintaining the biodiversity of these threatened montane environments.