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The newborn caterpillars are pale blue. Their color changes to green as they grow. They have two spots resembling eyes on the forefront of their body.
The caterpillars feed mainly on oleander (Nerium oleander) leaves, a highly toxic plant to which toxicity they are immune. They also may feed on most plants of the Apocynaceae family, such as Adenium obesum, and Tabernaemontana divaricata and Alstonia scholaris in India.