Here is an opinion from an Illinios birder on Bill Kosar's Red-tail.
On Monday, November 10, 2014 7:04 AM, Geoffrey Williamson < [email protected]> wrote: My opinion would not be very expert. I have only recently tried to get a good handle on these Red-tailed Hawk forms. The extensive underpart markings on this bird seem to be a strike against Krider's though. I would think that you would have to consider light-morph Harlan's but maybe the reddish tail is problematic for that. There is this concept of an "Eastern/Krider's intergrade," and I would not be surprised if the experts settle on that as a label for this individual. Hope you get some more informed views. Try Fraker and Berardi. Best, Geoff -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/CABF3siF%3Ds3mQ79RbNaAxeerZiht%3DCwMJw%2B6JCJg1SL7%2BEWE1UA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
