Creatures in this world are of two kinds, namely mobile and immobile. Mobile creatures are three kinds, namely O viperous O viviparous O heat and damp produced.
द्विविधानीह भूतानि चराणि स्थावराणि च। त्रसानां त्रिविधा योनिरण्डस्वेदजरायुजाः॥