This 2009 video from Britain is about curlews and their sound.
Translated from Ecomare museum on Texel island in the Netherlands:
Curlew freed from fishing line – 18-05-15
A broken fishing line can create problems for a long time in nature. A curlew experienced that firsthand. The bird got one of its legs caught in such a loose end. The foot of the animal was already fully grown around it, indicating that it had already happened a while ago. Scientists from the NIOZ Royal Dutch Institute for Exploration of the Sea happened to see the curlew during their regular bird research on the uninhabited Wadden Island Griend. They managed to remove the line.