• Introduction
• Winter guests
• Breeding birds
• Sexratio
• Survival
• Moulting head
• Defects in colouring
• Influenza research
• Articles
• Interesting life histories

• Introduction
• Ooijse Graaf
• Wylerberg
• Vlieland

• Introduction
• Ruddy Shelduck
• Swallow
• House Sparrow
• Little Ringed Plover
• Black-headed Gull
• Mandarin Duck
• Common Coot
• Egyptian Goose
• Sand Martin

• Introduction
• Ringed Plover and Kentish Plover
• Black-tailed Godwit
• Avocet
• Blackbird
• Northern wheatear
• Other ring research

• Introduction
• European ringtypes
• Colourcodes Black-headed gull and Common gull

• Black-headed gull
• Common gull
• Herring Gull
• Lesser Black-backed Gull
• Mediterranean Gull
• Yellow legged-gull