À propos de la première nidification de la Locustelle fluviatile en Belgique

The River Warbler Locustella fluviatilis is a small passerine bird found in dense deciduous vegetation close to water in bogs or near a river.
The song of this bird often mimics the sound local invertebrates (such as cicadas or bush-crickets), sometimes even mimicing different species day and night; this may divert the attention of potential predators into looking for something else
It breeds in east and central Europe into western Asia. It is migratory, wintering in east Africa. Its range is exanding towards Western Europe, and isolated singing males have been found in Switzerland and Belgoum. The 28th of May 2009, a singing male was found in a fallow land near Marche-en-Famenne, and it stayed at least until July. The 5th of August, two young birds were caught in a net, proving the first case of breeding of this oriental species in Belgium.
Didier Vieuxtemps and Philippe Goffart (Aves) answered our questions about this event.