(Portland, OR)  --  The Portland Audubon Society is releasing new details about the dozens of crows that fell out of the sky earlier this year.  The group says it has confirmed the birds were poisoned with a toxic pesticide called Avitrol.  The pesticide is a neurotoxin which can only be administered by a licensed official.  Now the Audubon Society is searching for the perpetrators, saying they likely violated federal law.  American Crows are federally protected by the MBTA.