Rossitten Bird Observatory
... that about a million birds were banded at the Rossitten Bird Observatory between its establishment in 1901 and the end of the Second World War?
... that about a million birds were <a href="./Bird_ringing" id="mwCvc" rel="mw:WikiLink" title="Bird ringing">banded</a> at the <b id="mwCvg"><a href="./Rossitten_Bird_Observatory" id="mwCvk" rel="mw:WikiLink" title="Rossitten Bird Observatory">Rossitten Bird Observatory</a></b> between its establishment in 1901 and the end of the <a href="./World_War_II" id="mwCvo" rel="mw:WikiLink" title="World War II">Second World War</a>?