The Eastern Tailed-Blue is the most commonly seen Blue in the state. It is found throughout the state from May though October. Although all the Blues may do some puddling, this species seems to be more prone to congregating in groups at moist areas along ponds and streams. I have seen nearly 100 Eastern Tailed-Blues along the edge of a five-acre pond in August.
Weekly sightings for Eastern Tailed-Blue
Above, the male is blue with a black border, an obvious tail, and an orange spot or two near the tail. The female is essentially the same below, but is black, not blue, above (see second photo). Below, the Eastern Tailed-Blue is a light gray with a variety of small black marks, a small tail (often very hard to see on worn specimens), and orange spots near the tail.
The Eastern Tailed-Blue should not be confused with any other Blue in the state, except in the far northwestern counties where the Western Tailed-Blue has been found. These two species are very easily confused in the field. In general the Western Tailed-Blue has less orange below in the male (one spot versus 2-3 in the Eastern) and the female has some blue basally while the Eastern female is mainly dark above.
Open, often disturbed areas, prairie restorations, and city parks.
The Eastern Tailed-Blue has 3-4 broods in Wisconsin, and is present as an adult from May through October.
Common throughout the state.
Chaffee Creek Area, East of Hwy 39/51, Marquette Co., WI, July 17, 2005.
White River Wildlife Area, Green Lake Co., WI. August 27, 2006.
Northwest of Redgranite, Waushara Co., WI. September 4, 2006.
DNR land southwest of Hancock, Waushara Co., WI. May 19, 2006.
Lunch Creek Wetlands SNA, Waushara Co., WI. July 6, 2005.