After the first reports of the breeding of Short-toed Eagle in Switzerland, the successful attempt was observed in Central Valais /map/ in 2017:
• Raphaël ARLETTAZ, Stéphane METTAZ & Klaus AGTEN, 2018 – Première nidification réussie du Circaète Jean-le-Blanc Circaetus gallicus en Suisse romande [The first successful nesting of Short-toed Eagle in Romandy] // Nos Oiseaux 65/3, N° 533: pp. 175-179. – 
(Fr).
The article is available on the University of Bern website.
The next recently published article is dedicated to tracking a breeding attempt of Short-toed Eagles in the Canton of Ticino /map/:
• Filippo RAMPAZZI, Luca PAGANO, 2017 – La nidificazione del biancone Circaetus gallicus nel Cantone Ticino (Svizzera) [Nesting of Short-toed Eagle in the Canton of Ticino (Switzerland)] // Bollettino della Società ticinese di scienze naturali, 105: 77-85. – (It) {rough translation}.
The record of successful breeding after the long absence of such data for central southern Switzerland can be considered as an evidence of Short-toed Eagle spread in Switzerland and northern Italy in recent years.
Our sincere thanks to Luca Pagano for kind sharing the paper!
The article by Lionel Maumary and others contains the detailed description of the first ST Eagle breeding in Switzerland /map/ in 2012, observations of the breeding biology and the diet data particularly:
• Lionel MAUMARY, Hubert DUPERREX, Jacques CLOUTIER, Laurent VALLOTTON, 2013 – Première nidification du Circaète Jean-le-Blanc (Circaetus gallicus) en Suisse – Observations sur la biologie de reproduction, en particulier le régime alimentaire [The first nesting of Short-toed Snake Eagle in Switzerland – Observations of the reproductive biology, and the diet] // Nos Oiseaux, 60: pp. 3-24. (Fr) {rough translation}.
More historical data about Short-toed Eagles in Switzerland can be found on a webpage of the journal Ornithologische Beobachter:
• Karl Daut, 1910 – Seltenere Vertreter der schweizerischen Avifauna. Der Schlangenadler – Circaetus gallicus (Gm.) [A rare representative of the Swiss avifauna. Short-toed Eagle] // Der Ornithologische Beobachter, VIII (1): pp. 1-3. – (De).
The former and present state of the species in the Canton of Valais /map/ is described in the communication, published this year:
• Lionel Maumary, 2015 – Nouvelle nidification du Circaète Jean-le-Blanc en Valais [New nesting of Short-toed Eagle in Valais] // Oiseaux.ch (Fr).
The following web resource deserves to be mentioned again: the map of the sighting locations is available for the registered contributors of Ornitho.ch only. However, any visitor of the site can view the photo gallery. The most of the pictures of Short-toed Eagles represented there have been taken in Switzerland.
The represented article contains the detailed history of records of Short-toed Eagles in Switzerland almost within a century of observations:
• Kéry, M. & B. Posse, 1998 – Auftreten des Schlangenadlers Circaetus gallicus in der Schweiz von 1900 bis 1993 [Distribution of the Short-Toed Eagle in Switzerland from 1900 to 1993] // Der Ornithologische Beobachter, 95: 39-54. – (De).
This year Short-toed Eagles’ breeding was observed in southwestern Switzerland /map/ for the first time. On the Oiseaux.ch website you can find the report on this written by Lionel Maumary:
• Lionel Maumary, 2012 – Le Circaète Jean-le-Blanc a niché en Suisse ! [Short-toed Eagle has bred in Switzerland] // Oiseaux.ch (Fr) {rough translation} – the text contains excellent pictures and video. Also photos of this pair of Short-toed Eagles taken by Thomas Nierle in April 2012 can be viewed here. The juvenile Eagle has left the nest succesfully!