I had a look at this and some connecting things, and found this quote from an interview ( here :
“They wasted nothing,” says Prof. Ran Barkai of Tel Aviv University, one of the explorers of Qesem Cave. When elephants were eaten (and they were), their bones would be turned into non-utile tools, indicating a compulsion to use all parts of the animal. Bird flesh would be consumed, tendons could be utilized as string, bones as tools, beaks and talons could be worn as pendants — and now it turns out the feathers were prized as well, according to the paper by Ruth Blasco, Avi Gopher and Barkai of Tel Aviv University, with Jordi Rosell and Antonio Sánchez Marco of University of Rovira i Virgili, due for publication in the prestigious Journal of Human Evolution."
Okay, so, what were the feathers used for?
Did they revere the swan and still kill it? Or revere it and adopt its attributes once they found it?
Or are the feathers tough to pull out in order to cook the bird?