Jeden Tag braucht er Nahrung im Umfang des eigenen Körpergewichts.
Während der kurzen Wintertage muss er in 6-7 Stunden genügend Insekten fangen, um die rund 17-stündige Nacht bei kalten Temperaturen im Freien zu überstehen.
Die nördlichen Brutgebiete werden im Winter vollständig geräumt, denn die dortigen kurzen Wintertage reichen wohl nicht aus, um genügend Reserven für die Nacht zu sammeln.
www.vogelwarte.chIt needs as much food every day as its own body weight.
During short winter days it has to catch sufficient insects within 6-7 hours to survive the approximately 17-hour night in cold weather in the open.
The northern breeding areas are completely vacated in the winter because the short winter days are hardly long enough to collect sufficient reserves for the night.
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