A year at a glance in Mercer County
When each species’ records usually fall in Mercer County, 2016 to 2025: the bar runs from the early to the late week, and the line marks the middle week. It shows when people recorded each species, not when it is there.
| Species | Usual weeks |
|---|---|
| Birds | |
| American White Pelican | No season: the weeks are still too uncertain |
| Bald Eagle | No season: recorded through most of the year |
| Dragonflies and damselflies | |
| Familiar Bluet | late June to mid-September, middle week Aug 9–15 |
| Common Whitetail | No season: the weeks are still too uncertain |
| Eastern Amberwing | No season: most records are from one year |
| Eastern Forktail | No season: most records are from one year |
| Eastern Pondhawk | No season: most records are from one year |
| Widow Skimmer | No season: most records are from one year |