The Caspian Gull’s European Advance: Root Causes and the Next Frontiers
A voice from Europe’s inland waterways — the Caspian Gull’s expansion is no longer a future possibility, but a process already underway. © Mark Johnson
Movement and Distribution

The Caspian Gull’s European Advance: Root Causes and the Next Frontiers

A powerful source population, a freshwater corridor and unusual ecological plasticity have carried the Caspian Gull from Ukraine to the North Sea — and further expansion seems inevitable.

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Six Years After First Breeding, Alpine Swifts Are Colonising Hungary
The Alpine Swift was considered a rare visitor to Hungary until breeding was first confirmed in 2020. Six years later, it is breeding in several Hungarian cities, and its numbers continue to grow. / El vencejo real se consideraba un visitante raro en Hungría hasta que se confirmó por primera vez su reproducción en 2020. Seis años después, se reproduce en varias ciudades húngaras y su población sigue creciendo. © James Hoagland

Six Years After First Breeding, Alpine Swifts Are Colonising Hungary

Six years after Alpine Swifts first bred in Hungary, their numbers are increasing and new breeding sites are appearing. What began as an exceptional event is starting to look like an established population.
News
Gyorgy Szimuly

Gyorgy Szimuly
When Can a Bird Afford to Moult?
Common Bulbuls can breed year-round, yet their moult remains strongly seasonal and responsive to body condition and diet. / Los bulbules naranjeros pueden reproducirse durante todo el año, pero su muda sigue siendo marcadamente estacional y responde a la condición corporal y a la dieta. © Jeff Maw

When Can a Bird Afford to Moult?

In Common Bulbuls, the conditions associated with starting moult differ from those associated with completing it quickly. An experiment in Nigeria shows how body condition and diet shape different stages of feather replacement.
Conceptual Notes Avian Diet
Gyorgy Szimuly

Gyorgy Szimuly
Do GPS Tags Affect Small Shorebirds?
Advances in lightweight GPS technology are allowing researchers to study the movements of even small shorebirds like the Kentish Plover (Anarhynchus alexandrinus) while carefully assessing the welfare implications of tagging. © Ayuwat Jearwattanakanok

Do GPS Tags Affect Small Shorebirds?

Solar-powered GPS tags are opening new possibilities in shorebird research — but how close are we to the limits of what small birds can carry without consequence?
Fieldwork and Technology
Gyorgy Szimuly

Gyorgy Szimuly
The Art of Recognition: Firefinch Reframes the Path to Becoming an Ornithologist
Unlike photography, illustration allows repeated field impressions to be compressed into a single scene — combining posture, behaviour, habitat, and the way a species is most often remembered by observers in the field. Cotton Pygmy Geese illustrated by Faansie Peacock for Firefinch. © Firefinch / Faansie Peacoc

The Art of Recognition: Firefinch Reframes the Path to Becoming an Ornithologist

Birding apps usually promise speed, certainty, and instant answers. Firefinch moves in another direction entirely – towards attention, illustration, and the slower process of learning how to truly recognise birds.
Fieldwork and Technology
Gyorgy Szimuly

Gyorgy Szimuly