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The nest from afar and from real close (Photoy: Márton Horváth, BirdLife Hungary).

The nest from afar and from real close (Photoy: Márton Horváth, BirdLife Hungary).

New world record! Four Eastern Imperial Eagle siblings successfully fledge in Hungary

August 16, 2021
Categories
  • Eastern Imperial Eagle
  • Hungary
Tags
Hungary

article by PannonEagle

Every year, BirdLife Hungary and the Hungarian National Park Directorates inspect all known Imperial Eagle (Aquila heliaca) nests in the country. This summer, 137 eagle chicks were ringed, and three chicks were equipped with satellite transmitters.   

During these annual checks, remains of prey and eggshells are gathered, as well as DNA samples of feathers, in order to collect as much information as possible about this declining species, currently listed as Vulnerable by the IUCN. These birds only breed once a year and unfortunately, almost one third of all breeding attempts fail. When the breeding is successful, only one, two, or on very rare occasions, three chicks fledge.  

This year, however, the researchers found something extraordinary. In one of the well-known territories of Körös-Maros National Park, four healthy Imperial Eagle fledglings were found in the same nest, which is unprecedented in Hungary.  

The nest with the four siblings was later found empty, meaning they all fledged successfully. Globally, there are only four reports of a single nest with four Imperial Eagle chicks, but the actual fledging of four birds has never been proven… until now! As far as we know, this is a world record! All chicks received ornithological rings, and we hope to meet them again in the future. 


Earlier reports of similar cases:  

  • 2008, Ukraine: three healthy young chicks, and a weaker, smaller sibling were photographed by Ukrainian researchers, but the nest was not checked later, and the faith of the chicks remains unknown.  
  • 2009, Kazakhstan: a nest with four eggs was found, but the nest was not checked later, and the faith of the chicks remains unknown.  

Recent cases recorded during the Pannon Eagle Life project:  

  • 2018, Austria: a nest with four chicks was found, but unfortunately the chicks fell out of the nest and died.  
  • 2018, Hungary: the remains of a chick were found under the nest with three chicks in it. 

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Stichting BirdLife Europe and BirdLife International gratefully acknowledge financial support from the MAVA Foundation, the EU LIFE programme, the European Commission and Vogelbescherming Nederland (BirdLife Netherlands).
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"Flight for Survival" is partially funded by the LIFE Against Bird Crime project. More information is available here.

Over 25 000 000 million birds are illegally killed around the Mediterranean, Northern Europe and the Caucasus every year. For non-rounded, mean numbers, and minimum/maximum estimates, see: Preliminary assessment of the scope and scale of illegal killing and taking of birds in the Mediterranean (Brochet et al 2016) and Illegal killing and taking of Birds in Europe outside the Mediterranean: assessing the scope and scale of a complex issue (Brochet et al., 2018)

“Flight for Survival” is a BirdLife International campaign managed by Stichting BirdLife Europe to raise awareness about the illegal killing of birds in Italy, Croatia, Cyprus, Greece, Egypt, Lebanon, Bulgaria and Hungary, and their conservation activities to fight this.” The species storylines for this campaign are heavily inspired by the information available on the migration habits of the selected birds.

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