At the moment we have an old fashioned string mop wedged into our fence. It was put there to dry, but now we can't remove it because we have noticed that a pair of Gold Finch Carduelis carduelis (Fr. Chardonneret élégant) are stealing fibres from it.
The couple must be building their nest in a neighbour's garden. As you can see in the first two photos, only the female collects nesting material. The male perches nearby in the clematis keeping guard. He isn't protecting her from predators, but from other male Gold Finches who may attempt to mate with her. According to Tim at Aigronne Valley Wildlife, he probably has several females in a sort of harem.