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-Center For Biological Diversity. Rockhopper Penguins. Biologicaldiversity.org https://www.biologicaldiversity.org/species/birds/penguins/rockhopper_penguins.html 

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-Guardian News and Media. (2011, April 16). Tristan da Cunha islanders rescue rockhopper penguins threatened by Oil Slick. The Guardian. Retrieved December 8, 2021, from https://www.theguardian.com/environment/2011/apr/17/rockhopper-penguins-tristan-da-cunha-rspb

-IUCN Red List. (2020). Northern Rockhopper Penguin. IUCN Red List of Threatened Species. https://www.iucnredlist.org/species/22734408/184698049

-NEAQ. (2010, July 27th) Northern vs. Southern Rockhoppers. New England Aquarium. http://penguins.neaq.org/2010/07/northern-vs-southern-rockhoppers.html

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-​​Trathan, P. N., García-Borboroglu, P., Boersma, D., Bost, C.-A., Crawford, R. J. M., Crossin, G. T., Cuthbert, R. J., Dann, P., Davis, L. S., Puente, S. D. L., Ellenberg, U., Lynch, H. J., Mattern, T., Pütz, K., Seddon, P. J., Trivelpiece, W., & Wienecke, B. (2014, August 7). Pollution, habitat loss, fishing, and climate change as critical threats to Penguins. Society for Conservation Biology. Retrieved December 8, 2021, from https://conbio.onlinelibrary.wiley.com/doi/10.1111/cobi.12349

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