Batrachochytrium dendrobatidis is a fungal pathogen that primarily affects amphibians, particularly frogs. It causes a disease known as chytridiomycosis, which disrupts the skin's ability to absorb water and electrolytes, leading to severe health issues and often death in infected animals. This pathogen has been linked to significant declines in amphibian populations worldwide, contributing to the extinction of several species. Batrachochytrium dendrobatidis thrives in moist environments, making amphibians particularly vulnerable, especially in regions experiencing environmental changes or habitat loss.