Talk about

A White-tailed Eagle Database Project

Moderator: maertha/felis silvestris

Post Reply
User avatar
ame
Moderator
Posts: 46291
Joined: April 7th, 2009, 10:26 pm
Location: Turku, Finland
Contact:

Re: Talk about

Post by ame » February 5th, 2016, 10:16 pm

Solo posted this video in a bit wrong place. maybe maertha will find a more suitable place?
On 05 Feb 2016, 20:39 Solo wrote: :hi: Liz, pls - where is the right place??? (topic) :blush: - TY :wave:
Swimming Eagle: https://www.facebook.com/luke.kim.1048/ ... 453576315/
the fishie was not small but not very big either and yet it prevented the eagle from getting airborne. i think that one could estimate the weight how much an eagle can take in the air based on this video. this eagle was a bald eagle i think but i suppose the same max weight would apply to WTEs, too. :rolleyes:

what was amazing was to see how the eagle rowed 'breast stroke' with unchanging pace over a rather long distance. it didn't seemed to be tired at all even after it got up to dry land. :thumbs:

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 5th, 2016, 11:40 pm

I put it into the WTE Video Collection (#40) viewtopic.php?f=46&t=251. Thanks, ame & Solo. New links are always appreciated; a good place for suggestions is “Add a Link or an Article” viewtopic.php?f=46&t=238

More footage of swimming eagles can be found here:
#40 viewtopic.php?f=46&t=251&start=40
#62 viewtopic.php?f=46&t=251&start=60

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 5th, 2016, 11:50 pm

USA: Trio of eagles

According to the Stewards of the Upper Mississippi River Refuge, 2015/2016 will be the third year that this trio of Bald Eagles has been together. For the first time it was possible to document their activities: "We have been watching them work on the nest for a month, now they are ready for the next stage.” (Source: Youtube video description.) Many thanks to forum member b.h-p for this interesting link.


Upload: Stewards of the Upper Mississippi River Refuge, 3 February 2016

And yes, White-tailed Eagles do it too. 8-) Some information on this subject, compiled last summer, below.

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 6th, 2016, 12:24 am

Would you see the third eagle? A note on alternative family structures

"Cooperative or ‘communal’ breeding occurs when more than two birds of the same species provide care in rearing the young from one nest.” According to current knowledge, only a few percent of bird species are cooperative breeders. But the number of undetected cases might be high.

Image
Screenshot and Photomontage: maertha/Latvian WtE cam http://dabasdati.lv/lv/kameras2015

Would we notice a third parent bird in or around a White-tailed Eagle nest where we usually expect to see a pair? Experiments show that it´s even possible to overlook a gorilla... “Cooperative groups may be overlooked in raptors (...) for several reasons:

(1) there are few raptor studies involving banded birds;
(2) many species have large territories, making it difficult for observers to see all individuals residing in the territory;
(3) many raptors are sensitive to disturbance and will avoid their nest or behave abnormally when a human observer is present; and
(4) distance between territories may make it difficult to monitor a large number of nests in enough detail necessary to detect cooperative behavior. In addition, because most raptors are thought to be monogamous, additional birds may be viewed by casual observers as transients and thus not recorded.” (Kimball et al 2003)

The most creative raptor concerning family structures seems to be the Madagascar fish eagle: “35 percent of the known breeding population exhibits cooperative breeding strategies”. (For more information see e.g.: Population status of the Madagascar Fish Eagle Haliaeetus vociferoides in 2005–2006, G. Razafimanjato et al. or The Eagle Watchers/Madagascar Fish Eagle, Ruth E. Tingay.) There are also some reports of Bald Eagle (Garcelon et al. 1995) and other eagle breeding trios. Gunnar Bergo, for example, describes such a group of Golden Eagles in Norway: “All three birds in the 'trio' took part in all breeding activities, but only two were sexed with certainty.”

Occasionally the White-tailed Eagle cooperates in a similar way. As yet I found these sources:
  • Scotland: “The establishment of the reintroduced population was slow at first. No eggs were produced until 1983 when one of two breeding attempts involved a trio (a pair with a second female); both clutches were damaged as a consequence. Such trios have since been observed in the Scottish population several times, and may persist for several years.” White-tailed Eagle. John A. Love in: The Birds of Scotland, 2007

    Unspecified: “Some eagles breed in polyandrous trios (one female with two males); this occasional behavior has been reported for some white-tailed sea eagles and Spanish imperial eagles”. The Eagle Watchers: Observing and Conserving Raptors around the World edited by Ruth E. Tingay and Todd E. Katzner, 2010

    Ireland: “White-tailed Eagles have successfully hatched chicks across four counties in Ireland. Eight pairs of White-tailed Eagles have nested and laid eggs with five nests successfully hatching chicks in counties Clare, Cork, Galway and Kerry. In the last few weeks’ chicks hatched in nests on Lough Derg at Mountshannon, Co. Clare, at Glengarriff in West Cork, and in Killarney National Park, Co. Kerry. Pairs also successfully hatched chicks at a nest in Co. Galway for the first time and at another site in Kerry. Three other pairs nesting in Kerry failed to hatch successfully. Interestingly two of these ‘pairs’ were made up of trios: two males and a single female at one site and two females and a male at another, both in Kerry!” Press release. Golden Eagle Trust, 2 June 2015. Update on the Kerry breeding trio, 20 September 2016 https://www.facebook.com/permalink.php? ... 4808950774

    Update, 16 August 2017. UK/Scotland. Also interesting: “A male sea eagle has successfully raised chicks from two different nests in East Scotland for the first time ever in Scotland. The eight year old male sea eagle, known as Turquoise Z, has been travelling between Angus and Fife visiting two nests, more than 28 miles apart, and raising chicks with two different females.” Read more at: http://www.fifetoday.co.uk/news/environ ... -1-4532872
  • Bergo, G. Territorial behaviour of Golden Eagles in Western Norway. Brit birds 80: 361-376, August 1987
  • Drew, T., Vo, M. L., & Wolfe, J. M. (2013). The invisible gorilla strikes again: Sustained inattentional blindness in expert observers. Psychological Science, 24(9), 1848–53
  • Garcelon, D. K., G. L. Slater, C. D. Danilson, and R. C. Helm. 1995. Cooperative nesting by a trio of Bald Eagles. Raptor Research 29:210-213
  • Kimball R. T., Parker P. G., Bednarz J. C. 2003. Occurrence and evolution of cooperative breeding among the diurnal raptors (Accipitridae and Falconidae). Auk 120, 712-729

Edit: The third eagle in the Latvian nest in the picture above was added by me, but theoretically it can happen ... Stay vigilant and question everything ;-).

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 6th, 2016, 4:47 pm

Update: Looduskalender Multi-Camera View

Urmas Lett created this feature last year. Click on the link below to see at a glance what´s happening at all monitored places. Click any of the thumbnail images to view the corresponding camera. The images should refresh automatically after 2 minutes. If that doesn’t work, try the "Refresh" button of your web browser.

http://pontu.eenet.ee/


maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 12th, 2016, 7:16 pm

How eagles went from worshipped ‘kings of the skies’ to victims of rat poison

Image
Public domain

“Say the word ‘eagle’ and the associations that come to mind are ‘soaring’, ‘majestic’, ‘eagle eye’ and ‘king of the skies’. (…) For centuries, eagles were respected for their strength and endurance as a predator. They were seen as a form or messenger of immortal Gods or royalty – from Zeus in Greek mythology to his Roman counterpart Jupiter, from Norse mythology to Celtic folklore, from Roman emperors to Catholic kings, and the Torah.” (Sanya Khetani-Shah, BirdLife International) Read more: http://www.birdlife.org/europe-and-cent ... rat-poison

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 13th, 2016, 4:24 pm

Place names where eagles dared

Image
After Ragnarök. By Emil Doepler (1855-1922), public domain

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 14th, 2016, 11:34 am

Happy Valentine´s Day!

I hope you saw the right bird this morning. :rolleyes: Whatever bird you saw first, "it is sure to foretell that you are a person that loves nature and that birds will be a part of your future for years to come and that is always a good omen!" Read more at Wild Birds Unlimited: http://blog.wbu.com/2012/02/14/valentin ... the-birds/

Happy Valentine’s from Geoffrey Chaucer http://www.gotmedieval.com/2009/02/happ ... aucer.html

Bird Feeder Webcams Bird Identification Useful Tools

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 15th, 2016, 9:11 pm

Update: Swedish hunter who killed eagle sentenced to one year in jail

Image
By Sandra Grampa (Own work) [CC BY-SA 3.0
(http://creativecommons.org/licenses/by-sa/3.0)]
via Wikimedia Commons


maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 16th, 2016, 5:22 pm

USA: Puppy saves Bad Eagle

The raptor exhibited signs of lead poisoning. “This fate is terrible for affected eagles, but is also completely preventable. If you deer hunt, please check out copper bulllets. They come in all sizes, and are an equally good if not better bullet. They cost slightly more, but isn't an eagle's life worth it? Learn more about non-lead ammo here: http://www.huntingwithnonlead.org."
Source, story and pictures: Wildwoods/Facebook: https://www.facebook.com/media/set/?set ... 035&type=3

A study shows that lead in hunting bullets is dispensable: Performance of Lead-Free versus Lead-Based Hunting Ammunition in Ballistic Soap. By Felix Gremse, Oliver Krone, Mirko Thamm, Fabian Kiessling, René Hany Tolba, Siegfried Rieger and Carl Gremse, published 16 July 2014, Plos One http://journals.plos.org/plosone/articl ... ne.0102015

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 16th, 2016, 5:28 pm

EU: Failure to ban toxic ammunition putting bird lives at risk

“Birds in Europe will continue to be put at risk from lead poisoning, as the European Commission today announces it will continue allowing the chemical's use in ammunition.” Birdlife.com, 4 February 2016 http://www.birdlife.org/europe-and-cent ... lives-risk

According to the Food Standards Agency (UK), "people who frequently eat lead-shot game, particularly small game, should cut down their consumption. This is especially important for vulnerable groups such as toddlers and children, pregnant women and women trying for a baby, as exposure to lead can harm the developing brain and nervous system." Read more: http://www.food.gov.uk/science/advice-t ... -with-lead

Image
"Lead is a particularly soft metal. (...) It is easily eroded and oxidized, and it becomes more toxic
and contaminant in acid environment." Photo: Public domain via Wikimedia Commons.


Background information Manufacturers of Lead-Free Bullets

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 20th, 2016, 6:59 pm

Interesting new book: The Most Perfect Thing: Inside [and Outside] a Bird's Egg by Tim Birkhead

“The Most Perfect Thing is about how eggs in general are made, fertilized, developed, and hatched. The eggs of most birds spend just 24 hours in the oviduct; however, that journey takes 48 hours in cuckoos, which surreptitiously lay their eggs in the nests of other birds. (…) Birkhead uses birds' eggs as wondrous portals into natural history, enlivened by the stories of naturalists and scientists (...)." Source: http://www.buteobooks.com/product/14610 ... rslib.html

Another interesting question: “What is it like to be a bird?” According to Birkhead, after decades of watching and studying birds he “began to realise that there was much more going on in a bird’s brain than we give them credit for. Birds see better and differently from us; their sense of smell, touch and taste are much better than we have so far imagined.” Lern more: http://bird-sense.com/the-book/

Image
Artist: G. van Raalten. Source: Naturalis Biodiversity Center/Wikimedia Commons
  • About the author: “Tim Birkhead is a professor at the University of Sheffield where he teaches animal behaviour and the history of science. He is a Fellow of the Royal Society of London and his research has taken him all over the world in the quest to understand the lives of birds. He has written for the Independent, New Scientist, BBC Wildlife.” (Amazon) Read more about Tim Birkhead http://bird-sense.com/author/
  • Literature search tip: KVK (Karlsruhe Virtual Catalog). Book search interface for more than hundreds of million books and serials in library and book trade catalogs worldwide.
    http://www.ubka.uni-karlsruhe.de/kvk_en.html

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 21st, 2016, 7:37 pm

Raptor: A Journey Through Birds by James Macdonald Lockhart – review

“In the opening chapter of Raptor, the author describes a Neolithic chambered tomb found on South Ronaldsay, Orkney. Among the remains of 340 people were the bones of 35 birds, two thirds of which belonged to white-tailed eagles. Archaeologists have concluded that the human corpses had been exposed so that they could be stripped of their flesh.” Read more: http://www.theguardian.com/books/2016/f ... d-lockhart
Author James Macdonald Lockhart: "My eyes are always quivering for birds of prey. I have always been turned to their presence". Source: HarperCollins
  • Image
[CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0), GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
Photo by Hayley Green, Inside the Tomb of the Eagles, Isbister, Orkney (Scotland)

See also:

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 23rd, 2016, 5:30 pm

Yay! Good news from Ireand

“Reassuring to know all 4 chicks hatched last year are alive, well and exploring the country. Better still we also know that the 2014 hatched Mountshannon chick was back on the Little Brosna callows in Jan 2016, the same area she spent last winter.” Golden Eagle Trust/Facebook, 23 February. Read more: https://www.facebook.com/pages/Golden-E ... =ts&v=wall

Image
Screenshot: maertha/LK grey seal cam

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 25th, 2016, 5:33 pm

Feds probing deaths of 13 bald eagles on Maryland’s Eastern Shore

“The U.S. Fish and Wildlife Service has opened up an investigation in Maryland after 13 bald eagles were found dead near a farm on the Eastern Shore on Saturday.”

Image
By Adrian Pingstone. Public domain

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 26th, 2016, 5:36 pm

Eagle-TV Denmark: DOF preapares for upcoming nesting season

“Danish Ornithological Society/BirdLife Denmark (in Danish: Dansk Ornitologisk Forening - DOF) is a private society working for the protection of birds and nature as well as the procurement of knowledge on birds” (source: dofbasen.dk). The nest is located on Lolland, the fourth largest island of Denmark.

Image

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » February 27th, 2016, 10:01 am

Denmark: The last season was very interesting – both eggs were destroyed by a marten in the early morning of March 20th (see video below). The clutch was replaced about ten days later. In early June one of the chicks was injured by the talon of a parent bird, even though the adults usually carefully clench their talons into balls in the nest (video: https://www.youtube.com/watch?v=PCWQ4V9 ... re=youtu.b). The eaglet survived, and the siblings left the nest around August 20th.


A marten destroys the first clutch. Video by DOFBirdLife

Here some general information on the subject and details about the Danish eagle family in English:
  • Replacement clutches in eagles – some notes and sources (see 23 April 2015)
  • Video documentation: Loss of the first clutch and laying of a replacement clutch in a White-tailed Eagle nest in Denmark (see 24 April)
  • viewtopic.php?f=46&t=236&start=280

maertha
Moderator
Posts: 4146
Joined: May 5th, 2010, 9:10 pm

Post by maertha » March 1st, 2016, 5:09 pm

Denmark: Eagle-TV season #4 has begun today

According to the Danish Ornithological Society (DOF), one egg is already in the nest since February 28th. Edit: Egg #2: 2 March. Information in Danish: http://www.dof.dk/om-dof/nyheder?nyhed_id=1435

Image
Screenshot: maertha, source: DOF http://pandion.dof.dk/havornetv

User avatar
Liz01
Registered user
Posts: 45351
Joined: January 21st, 2014, 2:06 pm
Location: Germany Berlin

Post by Liz01 » March 2nd, 2016, 12:39 pm

Greenpeace vs. NABU - Eagle in danger?

"Thus a conflict there is not every day: conservationists against environmentalists; Greenpeace against Naturschutzbund Germany (NABU). The problem: The Greenpeace offshoot Planet Energy wants to build wind turbines in the Weser valley near Rinteln. But in that very valley in the district of Schaumburg broods a pair of eagles, therefore comes fierce headwind from NABU"

https://www.ndr.de/nachrichten/niedersa ... ce486.html

Post Reply

Return to “The Haliaeetus Albicilla Collection”