Catching garden

The catching garden on Helgoland has been used to catch birds under standardised conditions since the 1960s. Birds are caught, ringed with a "Vogelwarte Helgoland" ring, measured and released to resume their natural behaviour. This globally unique data set comprises over 700 000 individual birds and can be used to investigate changes in bird condition or migratory behaviour over time. Such investigations have, for example, revealed that climate change has led to a change in the timing of bird migration.