Hello. I took this picture in January in Guadalajara (Central Spain) in a river area. I believe it's a nest, may be made by Remiz pendulinus?
https://drive.google.com/open?id=1wzc6HmIBXE2reeIphsK3FX-V7s-xv17y
https://drive.google.com/open?id=1wzc6HmIBXE2reeIphsK3FX-V7s-xv17y