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Vibrant Color: In real life, it’s a beautiful, vivid grass-green. However, the pigment is somewhat unstable; if the moth stays in the sun too long or is kept in an old collection, the green can fade to a pale white.Size: It’s the largest of the "emerald" group of moths in Europe, with a wingspan that can reach up to .Camouflage: Its scalloped wing edges and color make it look exactly like a birch leaf, which is its primary habitat.The Caterpillar: Even the larvae are masters of disguise—they look just like small birch twigs or catkins to avoid being eaten by birds.