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The Clipper is a fast flying butterfly and has a habit of flying with its wings flapping stiffly between the horizontal position and a few degrees below the horizontal. It may glide between spurts of flapping.
"A cline of colour".... The Clipper has a range of background colours, running from green in India to blue in Malaysia, brown in the Philippines and yellowish in Queensland. A gradually changing trait, such as colour, over a geographical region is known as a "cline" in biology.