Dear MARMAM, On behalf of my co-authors, I am pleased to announce the following publication: Fariello, C. M., Meynecke, J.-O., & de Bie, J. (2024). Defining humpback whale (*Megaptera novaeangliae*) potential distribution in the Great Barrier Reef Marine Park: A two-way approach. *Pacific Conservation Biology*, 30, PC23032. https://doi.org/10.1071/PC23032 *Context*. Humpback whale (Megaptera novaeangliae) populations have been recovering from whaling but are now facing threats from changing food availability due to ocean warming and changes in habitat suitability. There is uncertainty over whether opportunistic observations can produce reliable species distribution models (SDMs) and adequately inform conservation management. *Aims.* To compare SDMs for humpback whales in the Great Barrier Reef Marine Park based on different opportunistic sightings datasets and evaluate the impact different sources of opportunistic data have on our understanding of humpback whale habitat relationships. *Methods.* Maximum entropy modelling (Maxent) was used to create predictive models for humpback whale distributions. Sighting data from citizen science and opportunistic observations from various other databases were used. Models were compared to evaluate disparities and predictive capabilities. *Key results.* Distinct environmental variables [bathymetry, distance to the coast] were identified as the most relevant for each SDM. The best-fitting model diverged from an existing model, with humpback whale distribution predicted to be closer to shore. Areas with the highest habitat suitability were concentrated in the north-eastern coastal region across all models developed in this study. *Conclusions. *This study demonstrates that, with careful application and consideration, citizen science data can enhance our understanding of humpback whale distributions and contribute to their conservation. The research underlines the importance of embracing diverse data sources in SDM, despite the challenges posed by opportunistic data. *Implications.* The study provides valuable insights for conservation management and informs strategies to protect humpback whale populations in changing environmental conditions. *Keywords:* citizen science, climate change, GBRMP, humpback whale, Maxent, Megaptera novaeangliae, opportunistic data, SDM, species distribution model. The paper is available via the following link: (PDF) Defining humpback whale (Megaptera novaeangliae) potential distribution in the Great Barrier Reef Marine Park: a two-way approach <https://www.researchgate.net/publication/380855755_Defining_humpback_whale_Megaptera_novaeangliae_potential_distribution_in_the_Great_Barrier_Reef_Marine_Park_a_two-way_approach> Best regards, Ing. Consuelo Fariello PhD Candidate Griffith University