Nesting birds untie my string

Does anyone else have the problem with sparrows untying jute string? I have watched them tugging away at the string when I have tied in clematis and roses, they are very persistent.
I decide to offer some help to them,saved all the 'off cuts' and spent a few hours shredding each of the strands to make them soft and fluffy for nests. I then put them, along with some cotton wool into a disused feeder. The birds love it and now leave my clematis/rose ties alone.
It is amusing to see little birds fly off with a great beakful of nesting material - like flying Father Christmas'
I decide to offer some help to them,saved all the 'off cuts' and spent a few hours shredding each of the strands to make them soft and fluffy for nests. I then put them, along with some cotton wool into a disused feeder. The birds love it and now leave my clematis/rose ties alone.
It is amusing to see little birds fly off with a great beakful of nesting material - like flying Father Christmas'
A gardener's work is never at an end - (John Evelyn 1620-1706)
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I find tying in my plants very soothing.
'You must have some bread with it me duck!'
If you live in Derbyshire, as I do.
Now what can we offer them as nesting? I thought of putting yarn off cuts of cotton or wool but somebody said not to do that as it can get tangles around their legs and feet.
Any suggestion for helpful alternative would be appreciated?
I heard fur from brushing a cat or dog pegged to a line they quite like but I do have either animal as a pet.
Our basket liners have suffered the same fate, but at least it's for a good cause.