Today's featured picture

Green hairstreak

The green hairstreak (Callophrys rubi) is a small butterfly in the family Lycaenidae. It has a wingspan reaching about 26–30 millimetres (1.0–1.2 in) in length. The overside of the wings is a uniform dull brown, with two paler patches on the male's forewings made up of scent scales. The underside is bright green, with a thin white line that is often reduced to a faint row of dots or even missing altogether. The iridescent green colour of the underside is a structural colour caused by the diffraction and interference of light by microscopic repeating structures forming a diffraction grating in the wing scales. Green hairstreaks can be found at the end of March, with their flight time usually lasting until the end of June, but they are sometimes seen in July and early August. They never rest with their wings open, to maintain their green camouflage. The males exhibit territorial behaviour.

This picture, taken in 2015, shows a green hairstreak near Aston Upthorpe, Oxfordshire, within the North Wessex Downs Area of Outstanding Natural Beauty in the United Kingdom.

Photograph credit: Charles J. Sharp

Other areas of Wikipedia

  • Community portal – Bulletin board, projects, resources and activities covering a wide range of Wikipedia areas.
  • Help desk – Ask questions about using Wikipedia.
  • Local embassy – For Wikipedia-related communication in languages other than English.
  • Reference desk – Serving as virtual librarians, Wikipedia volunteers tackle your questions on a wide range of subjects.
  • Site news – Announcements, updates, articles and press releases on Wikipedia and the Wikimedia Foundation.
  • Village pump – For discussions about Wikipedia itself, including areas for technical issues and policies.

Wikipedia's sister projects

Wikipedia is hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other projects:

Wikipedia languages