The Caturmasya Observances and the Rite of Vishnu’s Sleep (Aśūnya-Śayana) and Shiva’s Monthly Vows
कङ्काः समं बलाकाभिरारोहन्ति नगोत्तमान् वायसाश्चापि सुर्वन्ति नीडानि ऋषिपुङ्गव वायसाश्च स्वपन्त्येते ऋतौ गर्भभरालसाः
kaṅkāḥ samaṃ balākābhirārohanti nagottamān vāyasāścāpi survanti nīḍāni ṛṣipuṅgava vāyasāśca svapantyete ṛtau garbhabharālasāḥ
「サギはツルとともに、最上の山々へと登る。カラスもまた巣を作る、聖仙の中の最勝者よ。これらのカラスはその季節に、懐妊の重荷によって倦み、眠りに就く。」
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Dharma is taught through observation of ṛtu-lakṣaṇa (seasonal characteristics): nature’s cycles—nesting, migration, gestation—become cues for human restraint, timing, and appropriate observance.
This is calendrical/ritual-auxiliary material (ācāra and kāla-nirṇaya style), not directly sarga/pratisarga/vaṃśa/manvantara/vaṃśānucarita, though Purāṇas often embed such instruction alongside them.
Birds nesting and ‘sleeping’ in season symbolize withdrawal and consolidation—an inward turn appropriate to rains—supporting the Purāṇic idea that correct practice follows the tempo of the cosmos.