"5. On the morning of the launch, higher frequencies were added to the interference grid to enable much-enhanced localization. The brains of small birds are very sensitive to these higher frequencies, due to their small diameter (wavelength) as a scalar EM receiver. If they remained in the area of localization, the birds would be in intense pain or killed. On the morning of the launch, national TV network news, announcers, noted that no birds at all were flying in the area, something which had never happened before."

"16. A few days later, from 1-4 February 1986, many birds inadvertently flew into the new, localized "pivot point" at Birmingham, Alabama, encountered the high frequency components, and dead birds fell from the sky in substantial numbers. Many different kinds of birds were involved. "

Tom Bearden
"Analysis of Scalar/Electromagnetic Technology"
1990
Ch: Historical Background of Scalar EM Weapons

http://www.cheniere.org/books/analysis/history.htm