Originally Posted by CARERY
I'm not sure what fact you are referring to but the subsaharan African Reed has a much shorter pp. I'm not sure about those resident oasis ssp. of Eurasian Reed...
The taxon of reed warbler that breeds in Iberia, Morocco, & Algeria, formerly treated as Acrocephalus scirpaceus ambiguus
, has been found to be genetically closer to African birds than other European birds, so is now treated as Acrocephalus baeticatus ambiguus
. See IOC list