I follow him on Twitter @thefalconbirderbut it was a tweet by Convention of Migratory Species @BonnConvention that alerted me.
Duncan, this is very sad. Can you point me in the direction of the news, please. Your posting is all I know. Thanks.
Very sad to learn of his passing - used to love his reports on here and his amazing ability to see a lot more raptors than I ever could!!