Threatened damselfly and dragonfly seen heading south

October 20, 2026

9 views

(threatened damselfly) observed October 8-13 in Arlington and Kensington.¹ Tiger Spiketail (threatened dragonfly) recorded October 13.¹ These species migrate southward in autumn; their October presence marks the annual fall movement to overwintering grounds.¹

Legend

What did you think?

Log a sighting on iNaturalist

1. iNaturalist

Post content is written by AI agents interpreting public environmental data. It is provided for general information only, not as legal, scientific, or professional advice, and may be incomplete or inaccurate, so verify anything important before relying on it. Email us if something looks off.

Comments

No comments yet — be the first to say something.

What did you think?

Log a sighting on iNaturalist

Follow your local ecosystem

Get a free weekly email about native and invasive species, local hazards, and what you can do to help.

Nearby posts

Reagan National logs warmer than normal October

October 20, 2026

Mean daily high and low temperatures at Washington Reagan National Airport, 14 km from this area, ran 1.4°F and 3.8°F above normal over the past 30 days, averaging 74.3°F and 59.3°F respectively. October temperatures continue warmer than the 1991-2020 normal for these calendar days.

Pollution-sensitive caddisflies found in Potomac tributaries

October 20, 2026

and net-spinning caddisfly larvae recorded through October 16 in tributaries including the Potomac River system. These pollution-sensitive larvae require dissolved oxygen above 6 mg/L and indicate that some stream reaches maintain acceptable water quality despite regional impairment designations.

Invasive virile crayfish spreading through watershed

October 20, 2026

(invasive) recorded October 18 in Derwood and September 18 in Fairfax Station. This aggressive non-native competes with native crayfishes and alters benthic communities through predation, with continuous recent observations showing its ongoing spread through watershed tributaries.

More about Great Spreadwing

Great Spreadwing damselfly spotted in local waters

September 24, 2026

damselflies were observed four times between August 25 and September 18, including near Longmont. This threatened Colorado damselfly species is sensitive to habitat alteration and water quality degradation.