The small blue (Cupido minimus) is a butterfly in the family Lycaenidae. Despite its common name, it is not particularly blue. The male has some bluish suffusion at the base of its upper wings but is mostly dark brown like the female. The species can live in colonies of up to several hundred and in its caterpillar stage is cannibalistic. The small blue is known for being the smallest butterfly found in the United Kingdom. It is a Priority Species for conservation in Northern Ireland and under the UK Biodiversity Action Plan.
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