He said it only takes starlings 17 minutes to build a nest.
"You're using your tractor, you come in for lunch and a cup of coffee, as it's warming down the starling can build the nest and when you go back out again to the tractor can go up in smoke very quickly."
The Rural Fire Force advise tractor owners to check under the bonnet every time before using a tractor, and when they have finished with the vehicle, pop the top and leave it open.