Bhagavatapurana 3.10.20

3.10.20

tiraścām aṣṭamaḥ sargaḥ so 'ṣṭāviṃśad-vidho mataḥ /
avido bhūri-tamaso ghrāṇa-jñā hṛdy avedinaḥ //

20. The eighth step in creation consists of birds and beasts and it has twenty-eight sub-classes; these beings are also destitute of knowledge of to-day and to morrow, mostly attached to the gratification of appetites, endowed with the power of scent, to know what is good to them and with no continuity of knowledge in the mind.