Ring-billed gull (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ring-billed gull" in English language version.

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allaboutbirds.org

Mandelbaum, Ryan F. (23 March 2021). "Oldest Ring-billed Gull on Record Discovered by Cleveland Birder". National Audubon Society. Retrieved 11 April 2021.
"Ring-billed Gull". Audubon. Retrieved 2024-04-22.

BirdLife International (2018). "Larus delawarensis". IUCN Red List of Threatened Species. 2018: e.T22694317A132541912. doi:10.2305/IUCN.UK.2018-2.RLTS.T22694317A132541912.en. Retrieved 18 November 2021.
Pollet, I. L., D. Shutler, J. W. Chardine, and J. P. Ryder (2020). Ring-billed Gull (Larus delawarensis), version 1.0. In Birds of the World (A. F. Poole, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.ribgul.01

BirdLife International (2018). "Larus delawarensis". IUCN Red List of Threatened Species. 2018: e.T22694317A132541912. doi:10.2305/IUCN.UK.2018-2.RLTS.T22694317A132541912.en. Retrieved 18 November 2021.
"The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species. Retrieved 2019-12-21.

Ray, C. Claiborne (30 September 2013). "Why do Sea Gulls Like Parking Lots?". New York Times. Retrieved 16 March 2014.