The hide on the estate, which is open 24 hours a day, was attacked by the vandals who smashed two windows and then tried to set it ablaze.
The hide will remain closed for several weeks, just as the summer holiday season begins.
David Thompson, Estate Manager for Dumfries and Galloway at NTS, said: “As dawn and dusk are the best times to enjoy wildlife, our hides on Threave Estate are open 24/7. We want to keep it this way, but regularly we’re finding our hides damaged by attacks like this. Our teams are working hard to repair this vandalism, but precious time and money is being lost in the process.”
Fire retardant paint helped to limit the damage at the hide, where bird watchers gather to…