„Hettumáfur“: Munur á milli breytinga
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Lína 36:
{{commonscat|Larus ridibundus}}
* {{Vísindavefurinn|48075|Á hverju lifa hettumávsungar?}}
* [http://www.bird-stamps.org/cspecies/6703500.htm
* [http://ibc.lynxeds.com/species/common-black-headed-gull-larus-ridibundus
* [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
* [http://www.ibercajalav.net/img/227_BlackheadedgullLridibundus.pdf Ageing and sexing (PDF) by Javier Blasco-Zumeta]
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