Is UV and blue-green egg colouration a signal in cavity-nesting birds? Węgrzyn, E. ; Leniowski, K. ; Rykowska, I. ; Wasiak, W. Abstract Publication: Ethology Ecology & Evolution Pub Date: April 2011 DOI: 10.1080/03949370.2011.554882 Bibcode: 2011EtEcE..23..121W