Saturday, September 30, 2017

Andorinhas return to the streets of Aveiro

September 29, 2017: 38 birds present at the known roost site in the PM. As if they never left. Discovered there by Davina & Daniel, on a big night out...

Friday, August 25, 2017

Schiermonnikoog (August 20 - 23)

All work and no play makes Jack a dull boy (and all play and no work made Jack a mere toy..?), so I was off to Schiermonnikoog, a small island located in the Dutch Waddensea, for an educational as well as recreational bird ringing experience at the "Groene Glop", our bed & breakfast & ringing station (with Joop vA (and family) and Jorien vS).

At times it was crowded at the coffee table. Captures can be found on

Bycatch: a Great Green Bush-Cricket Tettigonia viridissima

View towards the east, with Rottumerplaat on the horizon (where I once spent a summer looking towards the west...).

Northern wheatear Oenanthe oenanthe

Sunday, June 18, 2017

Holes in a wall

Catching and ringing Sand Martins Riparia riparia occupying an artificial nesting site (a purposely placed concrete wall). Today @ Sekdoorn (Stichting Avifauna Zwolle).

Monday, June 5, 2017

Little ringed plover chicky

Charadrius dubius, 12.8 gram. Ringed today @ VRS Hessenpoort, Zwolle.

Little ringed breeding habitat.

Thursday, May 25, 2017


Two-egg clutch of Barn Owls (Tyto alba guttata) in a wall mounted nest box located in a green suburb of Zwolle, The Netherlands. An infrared camera connection showed that one of the two breeding birds disappeared during early egg-stage (halfway April), but the true cause of failure remains unknown. The box was installed over 20 years ago and became occupied by a single Barn Owl pretty much every winter and occasionally in summer. During summer 2015 a second bird appeared and a first breeding attempt was made the following year, which also failed during early egg stage. Today the box got cleaned out, the eggs were removed and 85 pellets were collected and will be used to identify prey items.

Sunday, May 21, 2017

Phylloscopus trochilus acredula

Northern Willow Warbler, but a very difficult ID… Captured, ringed, measured and released today @ VRS Hessenpoort, Zwolle, The Netherlands.