Due to a number of reports of Sparrow kills in TRES boxes in recent years, some experimentation has been done with using Sparrow Spookers on nestboxes where Tree Swallows were nesting.

Spooker-1

Due to a number of reports of Sparrow kills in TRES boxes in recent years, some experimentation has been done with using Sparrow Spookers on nestboxes where Tree Swallows were nesting.