Originally posted on http://ift.tt/14bRKmK :

Whether the crows were intentionally murdered with pesticides remains to be seen, however across this state birds are being exposed to toxic poisons with each and every roadside spray and/or helicopter spray. What exactly is the state doing about that???

Portland crows died from pesticide, lab tests show; federal investigation continues
A pesticide commonly used to control nuisance birds caused the birds' deaths, but federal investigators are not identifying it because their investigation is continuing.