|On a post|
|Boxes in the field|
|Boxes by the Marsh|
|Flying around a Box|
|View from the field to the marsh|
Once there are younger eggs in the nest, adults will frequently dive-bomb intruders to drive them from the area. A big difficulty for both the tree swallows, and the Eastern bluebird are house sparrows. They also will take over the nesting boxes and even destroy the eggs all young of the other birds. The sanctuary staff will trap the house sparrows and removal from the area, hopefully they won't return and find another area to nest.