In my opinion, all the shots in Rob Hynson’s first set of images from various angles show a bird with very little black, on the mandibular unguis, located along the lower edge. This is contra the second bird, three minutes later, which consistently shows an almost wholly dark mandibular unguis. Therefore I reckon two birds were involved as shown in Raja’s images. If Raja would allow me to download her images, I could crop and place the bills in juxtaposition to demonstrate what I mean.
Mike Carter 30 Canadian Bay Road Mount Eliza VIC 3930 Tel (03) 9787 7136