Hi all, For those of us who keep track of bird sightings, as well as numbers of birds (eg., participating on Christmas Bird Counts, Summer Bird Counts, hawk-watches, sea-watches, feeder-watches, eBird, etc.), it is important to get an accurate count. Here is a link to an excellent lesson (part 1 of 2) on estimating numbers: http://ebird.org/content/ebird/news/bird-counting-101 Like anything else, this skill can be improved with practice. Frank Mantlik Stratford