Deluxe Repeating Sparrow Traps independent reviews:

• http://www.sialis.org/traps.htm (Scroll about halfway down on the page)
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House Sparrow Information

• HOSP are Nothing But Trouble by Ed Nied Jr.
• Additional HOSP info from Ed's Attracting Eastern Bluebirds page
• Audubon Society of Omaha website -  House Sparrows by Steve Eno
• House Sparrow History -  http://www.sialis.org/hosphistory.htm
• FAQ’s on Bluebirds’ competitors - http://www.bluebirdnut.com/Competitors.htm
• Documented HOSP attacks -  http://www.sialis.org/hospattacks.htm

Sparrow Spooker information:

• Bluebird Nut Sparrow Spooker info
• Sialis.org - Sparrow Spookers

Bluebird & Purple Martin Websites:

• Arlene Ripley - Nextbox
• Northern Sky's Purple Martin colony - Bob Buskas
• BluebirdNut.com
• Sialis.org
• Bluebird Nut Cafe discussion forum
• http://www.entrancesbysandy.com/
• Chuck's Purple Martin Page