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The pupae hang upside down. With rhythmic pulsations of its body, the butterfly works its way out of the pupal case. The wings are wrapped round the underside of the body. Pink drops of urine are shed from the stomach soon after hatching. Stretching of the wings takes about 8 minutes. Butterflies have no lungs. They breathe through air channels or trachea, which extend through the body. These trachea end at openings called spiracles which lie along the side of the insect body segments. They can be seen on t
