The pea blue butterfly, also known as the Long-tailed Pea Blue, is a widely distributed species with a wingspan of about 2.5–3.0 cm. It is known for the male's purplish-blue upper wings and the female's brown wings with a blueish tinge. A key feature is the "false head" created by two black spots and fine, tail-like filaments on the hindwings, which helps confuse predators.
Appearance and identification
Males: Have a vivid purplish-blue upper side with dark brown margins.
Females: Have a more muted appearance, with brown upper wings that have a blue-purple wash, especially on the forewings.
Underside: Both sexes share a light brown underside with white, linear markings and a pronounced white band near the outer edge.
"False head": The hindwings have two small black spots on the outer margin, with a sky-blue or metallic green rim, and a fine, tail-like appendage that mimics an antenna.
Size: The wingspan is typically between 2.5 and 3.0 cm.
Habitat and distribution
Widespread: Found across Europe, Asia, and Africa, and in parts of Australia and New Zealand.
Adaptable: Lives in a variety of habitats, including suburban gardens.
Migratory: This species is a strong and active migrant.
Behavior and life cycle
Flight: They have a fast and jerky flight style and often stay close to the ground.
Basking: They often bask with their wings partially open, both in the morning and around midday.
Feeding: Adults feed on nectar and may also be attracted to damp soil to absorb minerals.
Pest status: Can be considered a minor pest in gardens, as the larvae feed on leguminous plants like peas and beans.
Ant association: The larvae are sometimes attended by ants, which protect them from predators.
