Monthly Archives: July 2013

2cy Herring Gull Green 5.8 – 20130730

New database proof of concept: keeping track of markers

Yellow H.501 back in Leiden again – 20130728

Winter has arrived

New database project: working towards a new version

Common Gulls – Zoetermeer June/July 2013

IJmuiden harbour – 20130714

Are bare patches in Herring Gulls a sign of old age?

Happy birthday to “my” 27-year old Herring Gull

A study of 2nd-calendar year Lesser Black-backed Gulls in June