Interesting read about rare (or early etc.) breeding in Switzerland came out yesterday:
Les nicheurs rares en Suisse en 2023
www.ornitho.ch
Found the abstract in a civilized language:
In 2023 a pair of Western Cattle Egret Bubulcus ibis
bred for the first time in Switzerland. A pair of Little
Owl Athene noctua bred in north western Switzerland
for the first time in 40 years. The populations of Grey
lag Goose Anser anser (132 broods), White Stork Ciconia
ciconia (960 broods), Great Cormorant Phalacrocorax
carbo (3607 broods), Bearded Vulture Gypaetus barba-
tus (30 broods) und European Bee eater Merops apias-
ter (298 breeding pairs) have increased again in 2023. A
high breeding number was registered for Zitting Cisti
cola Cisticola juncidis (14 territories), a low number for
Spotted Crake Porzana porzana (9 territories). Common
Rosefinch Carpodacus erythrinus reached a new maxi
mum (66 territories). A systematic search for White
backed Woodpecker Dendrocopos leucotos in the canton
of Glarus, done for the first time, revealed 17 territories.
Rare breeding records or reports of territories were
found for: Eurasian Teal Anas crecca (1 brood), Common
Eider Somateria mollissima (1 brood), Common Golden
eye Bucephala clangula (1 brood), Black necked Grebe
Podiceps nigricollis (3 broods), Eurasian Dotterel Cha-
radrius morinellus (2 breeding pairs), Common Snipe
Gallinago gallinago (1 territory), Common Gull Larus
canus (1 breeding pair), Black crowned Night Heron
Nycticorax nycticorax (1 brood, the first in 12 years),
Western Marsh Harrier Circus aeruginosus (3 broods),
Moustached Warbler Acrocephalus melanopogon (2 terri
tories), Barred Warbler Curruca nisoria (1 territory) and
Tawny Pipit Anthus campestris (6 territories). A Spec
tacled Warbler Curruca conspicillata bred successfully
with a Common Whitethroat C. communis, and again
an Arctic Tern Sterna paradisaea bred with a Common
Tern S. hirundo. For the first time since the start of the
Austrian German reintroduction programme, a pair of
Northern Bald Ibis Geronticus eremita bred. The highly
pathogenic variant of avian flu affected Swiss breeding
birds for the first time, namely Black headed Gull Chroi-
cocephalus ridibundus and Common Tern