Greenish Blue (Plebejus saepiol)
- Description of adult and caterpillar, range, habitat, and ecology. With a photograph.
- http://imnh.isu.edu/digitalatlas/bio/insects/butrfly/famlyc/plsaf.htm

Karner Blue (Lycaeides melissa)
- Photos, physical description, range, habitat, and reproduction. Includes scientific classification.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Lycaeides_melissa.html

Large Blue Butterfly - Reintroduction into North Cornwall
- Photos and information about the project to reintroduce Maculinea arion into the county of Cornwall, England.
- http://www.cornwallwildlifetrust.org.uk/nature/inverteb/largeblue.htm

Large Blue Butterflies
- Extensive information about the unusual life cycle of Maculinea species, which are parasites inside red ant (Myrmica species) nests in the larval stage.
- http://www.zi.ku.dk/personal/drnash/atta/Pages/LargeBl.html