Scientists discovered that two harmful fungi, Fusarium falciforme and Fusarium keratoplasticum, are present on sea turtle nesting beaches across Costa Rica. These fungi can infect turtle eggs and cause high mortality rates in developing embryos. The researchers used advanced genetic techniques to accurately identify these pathogens and found them widespread at important nesting sites, highlighting the need for monitoring and protection strategies to prevent this emerging disease from becoming a major threat to sea turtle populations.