This bird has
some primary coverts pure white. A total of four birds with this feature were
seen on one single day, all very adult-like, but probably still sub-adults (notice e.g.
the much paler inner primaries).Photo 13: Graellsii adult, May 30 2000, Maasvlakte Rotterdam (Naaktstrand), the Netherlands.
This bird has
some primary coverts pure white. A total of four birds with this feature were
seen on one single day, all very adult-like, but probably still sub-adults (notice e.g.
the much paler inner primaries).