A groundbreaking study on Ulong Island, Palau, demonstrates a strong link between invasive species removal and ecosystem health. Researchers experimentally removed rats, leading to a resurgence in local seabird populations. This restoration triggered a cascade of positive effects, including increased nutrient transfer from land to the ocean—nitrogen in leaves increased by 80%. Consequently, fish biomass around the island rose dramatically by 183% within just one year. The research provides the first experimental evidence confirming that restoring seabird populations through rat removal actively aids coral reef recovery. These findings highlight the interconnectedness of island and marine ecosystems and emphasize the benefits of comprehensive island restoration efforts. The study suggests that similar interventions could be beneficial elsewhere.