Diferenzas entre revisións de «Carrán común»

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* [http://ibc.hbw.com/ibc/phtml/especie.phtml?idEspecie=1648 Common Tern videos] on the Internet Bird Collection
* [http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Common_Tern.html Common Tern Species Account] - Cornell Lab of Ornithology
* [https://web.archive.org/web/20090507030712/http://www.mbr-pwrc.usgs.gov/id/framlst/i0700id.html Common Tern - ''Sterna hirundo''] - USGS Patuxent Bird Identification InfoCenter
* [http://www.sdakotabirds.com/species/common_tern_info.htm Common Tern Information and Photos] - South Dakota Birds and Birding
* [http://www.madeirabirds.com/common_tern Common Tern Profile] - Madeira Wind Birds
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