Seabirds play a vital role in tropical oceans but are declining. Terns represent ~88% of breeding seabirds in BIOT but are understudied. This project will study tern ecology and develop a citizen science project (with long-term aspirations) with direct biodiversity conservation relevance. Enhancing BIOT’s capability to support good environmental monitoring and, given the crucial role seabirds play in coral reef resilience, this project offers wider dividends for habitat regeneration in the face of climate change.