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Your insect is probably an alderfly or snakefly

An alderfly and a snakefly

Order: Megaloptera
Body length: 0.5 - 15mm
Species: World - 4500, UK - 159

Adult alderflies are often found resting on alder trees near ponds and lakes. Their larvae are aquatic and live in water for up to two years before pupating and emerging as an adult.

Snakeflies have very long 'necks' giving them their common name. They eat aphids and are commonly found in thickly wooded areas.

Find out all about alderflies

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