chris murphy said:
Exactly. Crows mob other birds. So why is it that they are necessarily mobbing an IBWO as opposed to any one of the other larger birds found in North America?????
Well that question is fair enough. To my knowledge and from observation the birds that are being mobbed are making teal like calls. I know of no instance where a teal has been mobbed by crows. Also, the crows are in fact responding to the teal calls I make when the mobbing is going on. I also no of no owl or raptor that makes teal calls - birds that are mobbed by crows. We are also well aware that IBWO are mobbed by crows from reports from Cuba and Arkansas.
Since there are reports of teal like calls being made by IBWO one might put the pieces together to conclude that there is a possibility that A. the bird that is being mobbed MAY be an IBWO, particularly since there are no reports of teal being mobbed by crows or owls or raptors making teal calls. Or B. There is another answer of which we are not aware. This should be simple enough even for you folks to understand.
The next question becomes what to do with the information. An intelligent thought might be to A. consider the possibility that this is an IBWO and B. look to verify or disprove the theory that this may be an IBWO. One might then continue to do research and see if this is indeed a clue that may help someone in the field actually find a bird.
What would be plain stupid would be to ignore the information gathered and simply say, "IBWO are extinct". They may well be, (I know otherwise but this is stated in the abstract) but to merely accept that on faith is not very intelligent in light of the history of this bird. How many times does the bird's existance after being thought extinct need to be proven? Its clearly happened at least twice in the past. If Cornell, Mike, Cho, or I am correct, and I mean any one of us, that would make at least three times.
If you have the capacity to think it through the approach suggested really is no more difficult or different than learning what may be the call of an oriole and listening for it. Once it is heard you move to see the bird. If you find out in the process that it is not an oriole you might find out that it is another bird. In so doing you still learn something. There is nothing difficult, or even original, in the approach. If you still don't understand I am sure that if you look in Britain somewhere you will find a competent birder who will explain this process to you.