They can weigh anything from a few grams to several kilos. They propel themselves through the air for thousands of miles. And they’ve always held a special fascination for humans.
Here at Ottenby Bird Observatory, they’ve been ring-marking birds since 1946. Generations of enthusiasts have collected knowledge about our birds, how they live and where they move.
Ottenby Bird Observatory is administered by the Swedish Ornithological Society.
Birds are weighed, measured, photographed and ring-marked here. Magnus Hellström is the head of the Bird Observatory. Voiceover by Frank Spetland.