„Hettumáfur“: Munur á milli breytinga
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* [http://ibc.lynxeds.com/species/common-black-headed-gull-larus-ridibundus Myndbönd með hettumáfum] á the Internet Bird Collection
* [http://vireo.acnatsci.org/search.html?Form=Search&SEARCHBY=Scientific&KEYWORDS=larus+ridibundus&showwhat=images&AGE=All&SEX=All&ACT=All&Search=Search&VIEW=All&ORIENTATION=All&RESULTS=24 Myndasafn með hettumáfamyndum] VIREO
* [http://www.ibercajalav.net/img/227_BlackheadedgullLridibundus.pdf Ageing and sexing (PDF) by Javier Blasco-Zumeta] {{Webarchive|url=https://web.archive.org/web/20131112104357/http://www.ibercajalav.net/img/227_BlackheadedgullLridibundus.pdf |date=2013-11-12 }}
[[Flokkur:Máfar]]
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