Gábor Papp has collected and summarized information about colour-ringing of Short-toed Eagles in Hungary. The program has been continued for 7 years. The current numbers of ringed eagles, observations and photographing of the birds, prospects of new resightings are described
in the communication:
• Gábor PAPP, 2019 – Results of the colour-ringing scheme of the Short-toed Eagle in Hungary between 2013 and 2019 // short-toed-eagle.net (En).
This online database contains observations of birds in Western and Central Africa, including many records of Short-toed Eagles in Niger and Chad, i.e. in the traditional wintering area of the eagles from Europe and the Middle East. All records are linked to the map, some of them has photos taken in the wild, exporting data to MS Excel is available.
The Natuurtijdschriften site was already mentioned on HoverOverUs. Here we present to your attention some more articles published in different years and dedicated particularly to Short-toed Eagles:
• Bas VAN GENNIP & Bert DE BRUIN, 1996 – Nieuw voor Groningen: Slangenarend [New for Groningen: Short-toed Snake Eagle] // De Grauwe Gors, Vol. 23, No. 4: pp. 113-114. – 
(Nl).
• Arno IZAAKS, 2007 – Ruim vijf weken een Slangenarend Circaetus gallicus in de duinen van Meyendel (En) [More than five weeks an ST Eagle resided in the dunes of Meyendel] // De Takkeling, Vol. 15, No. 2: pp. 114-116. – (Nl).
• Chris VAN DEURSEN, 2010 – Slangenarend waarnemingen (Circaetus gallicus) in de regio [Observations of Short-toed Snake Eagle in the region] // Fitis, Vol. 46, No. 3: pp. 125-126. – (Nl).
• Willem VAN MANEN & Rob G. BIJLSMA, 2017 – Slangenarenden Circaetus gallicus in Nederland: voorschot op een broedgeval (En) [Short-toed Snake Eagle in the Netherlands: progress toward breeding attempt] // De Takkeling, Vol. 25, No. 3: pp. 224-241. – (Nl).
All documents with mentions of STE can be found using the site search.
Askar Isabekov has merged data from different birdwatching websites on the Birds of Northern Eurasia portal. This database allows to monitor appearing new pictures and observations of various bird species in several countries of Northern Eurasia, including Short-toed Eagles. At least 3 out of currently 12 regional sites were mentioned on HoverOverUs before.
Ildikó Baranyi is a wildlife photographer living in Romania. A lot of excellent pictures of the local nature are presented on her website. Among them you can find a photo-gallery dedicated to Short-toed Eagles. The eagles in intermediate and adult plumage, clear signs of the plumage replacement can be seen in the photos. All of them were taken in Romania, including ones of a 2cy individual summering in Europe.
This WordPress site is dedicated to identification of Raptors in the nature. The main idea was to provide easy uploading various pictures of birds of different age and sex, then, to describe and categorize them correctly, developing in this way a rich database for Raptors identification. All photos of any species can be found by one click, ones of Short-toed Snake Eagle as well. Descriptions of sex and age-related features are in English and Catalan.
Several records of Short-toed Snake Eagle at the boundaries of the species range were reported this summer. Local birders informed about observation of an eagle again in the United Kingdom, at Ashdown Forest /map/ in East Sussex: it was seen several times since June 21st. Unfortunately, the age of that bird has remained unknown. Four years earlier, a young Short-toed Eagle had been observed at Morden Bog /map/, near Wareham.
At the opposite side of the range’s northern boundary, not far from Barnaul /map/, the administrative centre of the Altai Krai, a Short-toed Eagle was recorded this year too. 
Photos of it are available on the Birds of Siberia website. This time it was an adult bird, as well as the previous one observed in 2016. Also, this summer has brought many encounters with ST Eagles to birders in Kazakhstan, just enjoy the pictures.