sattva-sańgād ṛṣīn devān
rajasāsura-mānuṣān
tamasā bhūta-tiryaktvaḿ
bhrāmito yāti karmabhiḥ
sattva-sangat -- by association with the mode of goodness; rishin -- to the sages; devan -- to the demigods; rajasa -- by the mode of passion; asura -- to the demons; manushan -- and to human beings; tamasa -- by the mode of ignorance; bhuta -- to the ghostly spirits; tiryaktvam -- or the animal kingdom; bhramitah -- made to wander; yati -- he goes; karmabhih -- because of his fruitive activities.
The word tiryaktvam means "the status of an animal," which includes all lower forms of life, such as beasts, birds, insects, fish and plants.