May-Collado, L.J., Bottoms, S., Durant, G., Palacios-Alfaro, J.D. and Alvarado, J.J. 2023. Southern Hemisphere humpback whales (Megaptera novaeangliae) (Artiodactyla: Balaenopteridae) singing activity at Caño Island Biological Reserve, Costa Rica before, during, and after COVID-19 lockdowns. Revista de Biología Tropical. 71, S4 (Oct. 2023), e57280. DOI:https://doi.org/10.15517/rev.biol.trop. v71iS4.57280.