A Yellow-browed Warbler (Phylloscopus inornatus) caught and ringed at Merzouga Ringing Station yesterday. As with the recent presumed hybrid Collared X Pied Flycatcher, it was ringed by Marc Illa and his co-workers.
Marc added in an email that “The bird had some fat, indicating probably a long flight, so perhaps coming from south of the Sahara (as it has been already documented to happen)”. [For non-ringers, fat is the subcutaneous adipose tissue used to fuel long-distance migration of birds].
The Yellow-browed Warbler in a rarity in Morocco: 18 records have been accepted by the MRBC so far. A bird at Rabat last autumn would be the 19th and this one would be the 20th (if both accepted).
The species is mainly encountered during autumn migration with some probable wintering records (e.g. a bird photographed at Tagdilt Track on 1 December 2017 is likely a wintering bird. While a bird that stayed at Rabat between 15 October and 3 November 2015 could have been a wintering or a migrant). During spring migration, the species is even rarer.
Marc is regularly publishing the updates of the ringing station at Yasmina Primavera blog (primavera means spring in Catalan).