The Common Blue is Britain\u2019s most widespread blue butterfly, found in grassland, meadows, roadside verges, and coastal dunes wherever its foodplants grow. Males are a vivid violet-blue with a narrow dark border and white fringe, while females are far browner, often with only a dusting of blue near the body and a row of orange spots along the wing edge \u2014 leading to frequent misidentification. Both sexes have undersides of grey-brown peppered with black spots and orange lunules, providing camouflage at rest. It thrives on unimproved, flower-rich grassland with its main foodplant, bird\u2019s-foot trefoil.<\/p>\n\n\n\n
Eggs are laid singly on the foodplant, usually bird\u2019s-foot trefoil but sometimes other legumes such as black medick or white clover, and the caterpillars are small, green, and slug-like, feeding by grazing the leaf surface. Interestingly, the caterpillars have a mutualistic relationship with ants, which tend them for the sweet secretions they produce in exchange for protection from predators. There are usually two, sometimes three, generations between May and October, with the species overwintering as a partly grown caterpillar low down in the grass sward.<\/p>\n","protected":false},"excerpt":{"rendered":"
The Common Blue is Britain\u2019s most widespread blue butterfly, found in grassland, meadows, roadside verges, and coastal dunes wherever its foodplants grow. Males are a vivid violet-blue with a narrow dark border and white fringe, while females are far browner, often with only a dusting of blue near the body and a row of orange […]<\/p>\n","protected":false},"author":22,"featured_media":9,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-18","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blues"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/posts\/18","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/comments?post=18"}],"version-history":[{"count":1,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/posts\/18\/revisions"}],"predecessor-version":[{"id":19,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/posts\/18\/revisions\/19"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/media\/9"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/media?parent=18"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/categories?post=18"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/testing20261014\/wp-json\/wp\/v2\/tags?post=18"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}