Universal Sparrow Trap
by Steve Gilbertson, noted Bluebirder
be used in PVC round boxes as well as NABS style boxes and a
wide variety of nestboxes
lightweight and easy to mount.
to see when trap is tripped by the red mark visible through the
entrance hole from a large distance.
be safely left in the box using the U-shaped wire which holds
the trap and prevents it from trapping till needed. This is very
handy with highly cautious birds which may take a long time to
re-enter an "armed" nestbox. This caution later disappears
allowing the birder to remove the wire clip and trap the bird.
be used in top, side, and front opening nestboxes.
Natural Looking PVC Nestboxes
Article - The Story About the Gilbertson Box]
for Eastern Bluebirds, Tree Swallows, Black Capped Chickadees
and House Wrens and Nuthatches
Gilbertson Natural Looking PVC Nestbox..........................$20.00
GBBH-3 #-pak of Gilbertson Natural Looking PVC Nestboxex......$54.00 plus S/H
Call The Purple Martin Society: (815) 744-9958)
Mr. Steve Gilbertson, Akin, MN, is a recognized authority in the Eastern Bluebird
interest and in bluebird housing. His natural looking PVC houses are different
than most bluebird houses, particularly due to their smaller compartment design.
The compartments are smaller than most bluebird boxes but this works against
the House Sparrows nesting. Sparrows find the boxes do not meet their nesting
requirements, therefore the Gilbertson boxes become sparrow resistant (not
about Gilbertson PVC Nestboxes:
degree of House Sparrow resistance while being highly desirable
to bluebirds, tree swallows, chickadees and wrens.
body minimizes premature fledging and allows easy viewing.
cannot cling to smooth hard surface.
easily removed by squeezing top opposite pins.
floor admits no moisture via capillary action. Check and clear
center drain hole as needed.
drip edge and roof overhang nearly eliminates all driven rainwater
into nest cavity.
birch appearance does not significantly fade with age.
at approximately 1 1/2 lb simplifies mounting.
PVC Testimonial: Quote from an article by Kevin Berner, Chair
of the Research Committee of The North American Bluebird Society:
Gilbertson of Minnesota has had good luck with bluebird boxes
constructed from 4-inch PVC fitted with a wooden roof. He is
promoting these boxes as sparrow resistant. Gilbertson feels
sparrows avoid the slick plastic surface. The boxes are mounted
on a 1/2-inch conduit treated with carnauba car wax to predator-proof
the pole. I conducted tests on these boxes for several years
and had moderately high bluebird use. I have had almost no use
of these boxes by house sparrows. This is the box design I would
most recommend for individuals having problems with house sparrows."