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80% lost in just ten years - that is horrifying, but I can believe it after our experiences here. My heart is in my mouth for the pair on the curlewcam, especially at night. I fear a close-up view of a fox or badger, then a totally empty nest. Two years ago on the osprey cam at Loch Arkaig, we watched in horror as a pine marten appeared in the nest one night, scared off the female osprey, then one after the other made off with the three half incubated eggs. So that was a failed breeding season for them. (they have since bred successfully and the tree is now protected against pine martens )
It's great that you have now heard and seen a second curlew calling.
I shall be watching the nest cam avidly next week.