Living as a tortoise for ten years, he is born as a porcupine. After that he has to take birth as a snake, and living for six months in that form he regains human form.
कच्छपो दश वर्षाणि त्रीणि वर्षाणि शल्यकः। व्यालो भूत्वा च षण्मासांस्ततो जायति मानुषः॥