Strymon melinus
In 3 days ~40% in a week ~70%
The gray hairstreak (Strymon melinus) is also called the bean lycaenid or cotton square borer. It is a member of the Lycaenidae family, known as the gossamer-winged butterflies and the second-largest family of butterflies. It is one of the most common hairstreaks in North America, ranging over nearly the entire continent. It also occurs throughout Central America and in northern South America.
The adult gray hairstreak has a wingspan of 20–32 millimetres (0.79–1.26 in). The upper sides of the wings are gray with an orange spot on the hind margin. The underside of the wings are a lighter gray with white and black lines and orange and blue marginal spots near the hind-wings' tail-like extensions. These extensions twitch while at rest, and may imitate a separate head to encourage predators to go for the wings, potentially allowing the insect to survive.
Caterpillars are green with markings on the sides, covered in short yellow hairs. Like other caterpillars in the Lycaenidae family, S. melinus are attended by ants in a behavior known as myrmecophily. The gray hairstreak lives in a wide range of habitats ranging from tropical forests and mountains... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | Dallas | 🇺🇸 United States | |
| 3 | Valencia | 🇻🇪 Venezuela | |
| 4 | San Antonio | 🇺🇸 United States | |
| 5 | Sacramento | 🇺🇸 United States | |
| 6 | Portland | 🇺🇸 United States | |
| 7 | Tijuana | 🇲🇽 México | |
| 8 | Mesa | 🇺🇸 United States | |
| 9 | San Francisco | 🇺🇸 United States | |
| 10 | San Diego | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Gray Hairstreak sighting in Tijuana on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 17th most-seen of the 43 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
June and August–September
In those months about 30% of wildlife watchers report a Gray Hairstreak in Tijuana on a given day, against under 5% in May and November–February, the lowest months. Those are among Tijuana's driest months, with about 10 mm of rain a month against 55 mm in February.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Gray Hairstreak sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
7th of 32
Of the 32 cities where we can rate Gray Hairstreak sightings, Tijuana ranks 7th at about 20%. The best odds are in Austin (United States, about 30%), Dallas (United States, about 30%) and Valencia (Venezuela, about 20%).
Same family: Lycaenidae
The closest relatives of the Gray Hairstreak that you can see in Tijuana (family Lycaenidae, Gossamer-winged Butterflies) are Western Pygmy-Blue (about 20%) and Marine Blue (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Gray Hairstreak is recorded against all the insects logged in Tijuana (12 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
