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  1. To identify blue butterflies in the UK, look for the following features123:
    • Smallest butterflies with fast, erratic flight pattern
    • Distinctive bluish shimmer on dark brown wings in males
    • Uniformly colored females
    • Black-spotted, silver ventral sides when wings are closed
    • Holly Blue: Wings open, basking on ivy foliage. Females lack orange spots on wings.
    • Common Blue: Both males and females have blue upperwings. Females have orange spots on wings.
    Learn more:
    Look for the smallest butterflies with a fast, erratic flight pattern, typically around grasslands and woodland edges. Males display a distinctive bluish shimmer on their dark brown wings when open, whereas females are more uniformly colored. Both sexes have black-spotted, silver ventral sides when their wings are closed.
    www.butterflyidentification.com/small-blue.htm
    Both male and female Holly Blues and male Common Blues have blue upperwings and look blue in flight. Female Common Blue butterflies vary from brown to mostly blue, but always have a distinctive series of orange spots towards the edges of their wings, that Holly Blues don’t have. The key distinguishing feature is the undersides of the hindwings.
    butterfly-conservation.org/news-and-blog/dont-get-t…
    Living up to its name, this butterfly is the commonest blue found in the British Isles. While the male has bright blue uppersides, the female is primarily brown, with a highly variable amount of blue. This is the most widespread Lycaenid found in the British Isles and can be found almost anywhere, including Orkney.
    ukbutterflies.co.uk/species.php?species=icarus
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  3. How to identify different blue butterfly species in the UK

  4. Common blue - The Wildlife Trusts

    Scientific name: Polyommatus icarus. The common blue butterfly lives up to its name - it's bright blue and found in all kinds of sunny, grassy habitats throughout the UK! Look out for it in your garden, too.

  5. Blue butterflies - The Wildlife Trusts

  6. How to tell Britain’s blue butterflies apart: Differences, histories ...

  7. A guide to the blue butterflies | Berks Bucks & Oxon …

    May 17, 2023 · Identifying blue butterflies. Some species are easy to identify, but others can be difficult to distinguish and rely on closer inspection, particularly of the markings on the undersides. It can help to know which larval hostplants …

  8. Identify British butterflies | The Wildlife Trusts

    Spotted a butterfly but not sure what it is? Here are some common British butterflies you might see in your garden, and how to identify them.

  9. Common Blue - Butterfly Conservation

    The Common Blue is the most widespread blue butterfly in Britain and Ireland and is found in a variety of grassy habitats. The brightly coloured males are conspicuous but females are more secretive.

  10. UK Butterflies - Common Blue - Polyommatus icarus

    Introduction. Vernacular Names. Living up to its name, this butterfly is the commonest blue found in the British Isles. While the male has bright blue uppersides, the female is primarily brown, with a highly variable amount of blue.

  11. Identify a butterfly

    You can set or adjust your search criteria in the left hand column below. If you know which butterfly you would like more information on, use our butterfly A to Z.