Very lightweight and easy to mount.

Easy to see when trap is tripped by the red mark visible through the entrance hole from a large distance.

Can 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.

May be used in top, side, and front opening nestboxes.

Gilbertson Natural Looking PVC Nestboxes

[View Article - The Story About the Gilbertson Box]

Perfect for Eastern Bluebirds, Tree Swallows, Black Capped Chickadees
and House Wrens and Nuthatches

GBBH Gilbertson Natural Looking PVC Nestbox..........................$20.00 plus S/H
GBBH-3 #-pak of Gilbertson Natural Looking PVC Nestboxex......$54.00 plus S/H
Call The Purple Martin Society: (815) 744-9958)

Gilbertson Nesboxes:

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 sparrow proof).

Information about Gilbertson PVC Nestboxes:

• High degree of House Sparrow resistance while being highly desirable to bluebirds, tree swallows, chickadees and wrens.
• Removable body minimizes premature fledging and allows easy viewing.
• Predators cannot cling to smooth hard surface.
• Body easily removed by squeezing top opposite pins.
• Recessed floor admits no moisture via capillary action. Check and clear center drain hole as needed.
• Circular drip edge and roof overhang nearly eliminates all driven rainwater into nest cavity.
• Attractive birch appearance does not significantly fade with age.
• Lightweight at approximately 1 1/2 lb simplifies mounting.
• Premium cedar roof.

Gilbertson PVC Testimonial: Quote from an article by Kevin Berner, Chair of the Research Committee of The North American Bluebird Society:

"Steve 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."