Hi All: I`m fortunate to have birded with a friend this fall who taught me the " tink, tink " call note of Bob-o-links and the " squeak " of the Rose Breasted Grosbeak, the latter sounding like a rubber sneaker sole " squeaking " on a hardwood floor. It`s amazing how once you`ve learned these you can really zero in on birds flying overhead, and makes me aware of all the birds I`ve missed. Winter finches are next on the agenda. Leslie Fisher Cecil Bird Club North East, Md