After hawks and eagles, some of the sharpest eyes belong to hawk-watchers, experienced spotters who count raptors during spring and fall migration. Groups like HawkWatch International organize census counts of hawks (like this Red-tailed Hawk) and other raptors. HawkWatch sites lie along primary migration routes like mountain ridges and coastlines, where updrafts of rising air funnel the birds’ north-south movement. Different species peak at slightly different times. Learn more at BirdNote.org.