The Baffle Box
I have invented a new nestbox which is raccoon resistant. Essentially
it is a Tree Branch nestbox with the ends folded up so that it is not so
long and awkward to mount. It consists of a box 13" long, 7
1/2" wide, and 7 1/2" high. There is a 1 9/16" entrance
at each end - one near the front and the other near the back. There are
4 1/8" baffles inside the box spaced 2" in front of each entry
hole. The baffle at one end of the box is against the front of the box
and the baffle at the other end of the box is against the back of the
box. There are appropriate drainage and ventilation holes.
In order to use the box, a bird enters the entry hole and goes around
the baffle to the center of the box to build a nest. They will not build
a nest at the entry because there is much too little space. A raccoon is
not able to reach the nest because of the baffle. In fact, a raccoon
can't reach any part of the nest to pull it. The second entry hole is an
escape hole in case bluebirds are attacked by sparrows (or any other
predator). I have tested it last year and a bluebird nested
in it successfully. I suspect that bluebirds would prefer most any other
nestbox instead of this one because of the restricted entry. We know
that in preference tests bluebirds choose the largest, easiest entry,
but we can't let a birdbrain design our nestboxes (Jack Finch).
Preference tests in my area are meaningless. There are no other
choices and bluebirds must use whatever I put out. I have tried many
designs and they use them all. I would have nearly 100% usage if I
didn't keep expanding into new areas.
Disadvantages of this box is that it takes more material than a
conventional box and it is bigger and more difficult to mount. However,
if it truly does stop raccoons it would be a great solution for
locations with a serious raccoon problem.
The inside nesting area is 6" by 6". The entrances are at
the small ends - one is at the front edge and the other at the back
edge. The birds do not go over or under the baffle but must go around
it. Either a front or top opening can be employed. I use a front opening
with a 1/4" ventilation gap at top. A top with large overhangs
would be a bit more difficult to open. The dimensions allow the use of
standard 8 inch material (7 1/2" finished).
Unfortunately it does not lend itself well to use as a hanging box
which is my specialty. I did hang mine but it was awkward.
Posted with permission of Dick
Purvis
