Sunday, May 3, 2015

2015 Bluebird Trail

Dave and I are a month or so into our fourth year of monitoring blueboxes in the Northfield area. This year, in addition to the two trails we've been covering in previous years (one currently with 12 boxes along rural roads south of Northfield and the other with five boxes near Randolph), we've taken on (at least for this year) another existing trail in the Carleton Arboretum that has 9 pairs of boxes over about a two-mile walking trail.

This trail uses a different type of nestbox than we're used to -- the modified Gilwood rather than the Gilbertson PVC style -- so that's been a learning curve. (See a comparison of box styles.) Both are mounted on conduit poles for good predator deterrence. (Please don't mount bluebird boxes on wooden fence posts and other areas where cats, raccoons, snakes and other predators can easily access a buffet of eggs and nestlings. If you have older-style boxes mounted in that way, you'd be doing a good deed by replacing them with newer pole-mounted boxes. If you're in our area and would like help replacing older boxes, message me and I'll be glad to help make that happen.)

The Gilwood has a front-opening door which is probably less alarming to a bird that happens to be sitting on eggs during a box check than the action of detaching the PVC box from its roof as you do to check inside the Gilbertson boxes. However, Dave and I aren't very tall, and even after lowering most of the boxes we find we need to use a small mirror on a wand (available at auto supply stores) to see the contents of the nests. Photography of box contents would be difficult indeed.

As of this week we have quite a few bluebird eggs, more nests that don't have eggs yet, and also much nesting activity by tree swallows. This morning as we walked the new trail I was able to get some nice photos of both bluebirds and tree swallows -- sometimes in the same shot.

Click any of the photos to see them larger.


chautauqua said...

Lovely photos! Thanks!!

Penelope Hillemann said...