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Posts tagged ‘display flight’


Bernard Joubert’s article on communication of ST Eagles

Dec 10, 2017 / 1 Comment

Photos taken by Bernard Joubert: Short-toed Eagles' communication posturesThe following paper by Bernard Joubert on Short-toed Snake Eagle communication abilities was recently published:

• Bernard JOUBERT, 2017 – Circaète Jean-le-Blanc : des "mots" pour le dire [Short-toed Eagle: "words" to tell] // Rapaces de France, n° 19: pp. 54-55. – Short-toed Eagle. file (Fr) {rough translation}.

The summary

Short-toed Snake Eagles have the rich social language, various tools which help them to express their intentions and relation to behaviour of other representatives of their species. The main problem of studying their behavioural language is defined by difficulties of correct interpretations. Besides various vocal signals, these eagles reveal a rich body language vocabulary, thanks to the extraordinary plasticity of their plumage, which is used for hovering in different airflows while hunting. Simplistically, 3 types of signals are identified: those related to movements, postures and holding of plumage.

Examples of the gestural communication are: aggressive demonstratively slow and strong wing-beats, so-called «vulture» flights, territorial «festoon» display flights.

Communicating through postures includes: an aggressive «albatross» posture, a posture of «angel» which is used for marking a chosen nest for the partner.

Communicating through appearance changes at close contacts comprises states of occipital feathers and pupil size, which can express both tension and relaxation of birds.

This brief review is nothing more than an invitation to observe and puzzle out those various and subtle means of ST Eagles’ communication.

 

La Plume du Circaète n° 13-14-15

Apr 30, 2017 / Comment
La Plume du Circaète on the LPO website

This issue of La Plume du CircaèteShort-toed Eagle. file (Fr) {rough translation} contains materials of the 4th meeting of the Short-toed Snake Eagle French national network, conducted in Roquefixade (Ariège) on October 8-9, 2016. The list of contents (En):

p.2
· 4 years of observations on 30 sq. km in Aveyron
p.5
· Monitoring of a population on an area of Ariège
p.8
· Monitoring in the Marseille region
p.10
· Study of a reproduction using a photo-trap
p.16
· Monitoring, research and conservation in the Alpes de Haute-Provence
p.18
· Short-toed Snake Eagle in forest management
p.20
· Three behaviours: nest change; interspecific relationships; festoon flights
p.22
· General review of monitoring in the Aude
p.23
· Ageing of Short-toed Eagle chicks

Many thanks to Bernard Joubert, Jean-Pierre Malafosse, Manon Munoz, Renaud Nadal and all the authors of the bulletin for sharing knowledge!

 

STE in Northern Ukraine. Video & data on breeding. 2016

Mar 26, 2017 / Comment

Short videos representing scenes of life of Short-toed Eagles in Northern Ukraine have been compiled from those that were shot in previous year. Also, you can view here a few tables containing statistical data collected in the region within 2004-2016 years and processed to a certain extent. The artificial platform for Short-toed Eagle nestingThey include: general breeding success, frequency of nesting tree change, distances between two nesting trees occupied by one pair in two consecutive seasons and between all nesting trees at the same breeding sites, nesting tree diameter, nest height, mean nest departure dates, reproduction rate of certain pairs.

 

Meeting in Roquefixade (France), a brief review

Oct 30, 2016 / Comment
Roquefixade: a lot of sites for Short-toed Snake EaglesParticipants of the 4th Circaetus meeting

After Langeac (2004), Nadaillac (2008), and Florac (2012) the 4th Circaetus meeting took place in Roquefixade (the Ariège Department), on October 8th and 9th, 2016. Forty naturalists involved in the monitoring of the species, found themselves there at the invitation of Nature Midi-Pyrénées and LPO Mission Rapaces, to share their experience of the studies. The total number of the meeting participants was about fifty. The program illustrated the diversity of birders’ approaches within their means and goals.

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Some videos of Short-toed Eagles taken in April

Apr 28, 2015 / Comment

There are some fresh videos for April: three of them have been made with the camera installed at a nest of Short-toed Eagles in Israel /map/ by Guilad Friedemann.

The last two ones were taken from a distance in Northern Ukraine /map/ by me. Please note that all the clips are available in HD quality.

 

Some data on their arrival at Ukraine

Apr 6, 2009 / Comment
Short-toed Eagle's Festoon flight in pictures

Some data on spring arrival of Short-toed Eagles to Ukraine is available now on the map. The first dates are: 28th and 29th (in display flight) of March – observations of Sergey Domashevsky in Mizhrichynskyi Regional Landscape Park /map/ (Chernihiv Region); 4th of April – observations of Konstantin Pismennyi (Kiev Region /map/, in display flight), Maxim Gavrilyuk and Nikolay Borisenko (Cherkasy Region). Also you can see the comparative data of the records in Bulgaria – observations of Dimitar Ragyov near Plovdiv.

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