Dutiyagaddulabaddhasutta 3.1

3.1

Nāhaṃ, bhikkhave, aññaṃ ekanikāyampi samanupassāmi evaṃ cittaṃ yathayidaṃ, bhikkhave, tiracchānagatā pāṇā.

I don’t see any other order of beings as elaborate as the animal realm.