In this verse we can understand that the various types of living entities were created simultaneously at the very beginning of the creation. The nonsensical Darwinian theory of evolution is not applicable here. It is not that intelligent human beings did not exist millions of years ago. On the contrary, it is understood that the most intelligent creature, Lord Brahma, was first created. Then Lord Brahma created other saintly sages like Marici, Bhrgu, Atreya, Vasistha and Lord Siva. They in their turn created different types of bodies according to karma. In Srimad-Bhagavatam Lord Kapiladeva told His mother that the living entity gets a particular type of body in accordance with his work and that this body is decided upon by higher authorities. The higher authorities, as appointed by the Supreme Personality of Godhead, are Lord Brahma and all other Prajapatis and Manus. Thus from the beginning of creation it can be seen that the first creature is the most intelligent. It is not that so-called modern intelligence has developed by the gradual process of evolution. As stated in Brahma-vaivarta Purana, there is a gradual evolutionary process, but it is not the body that is evolving. All the bodily forms are already there. It is the spiritual entity, or spiritual spark within the body, that is being promoted by the laws of nature under the supervision of superior authority. We can understand from this verse that from the very beginning of creation different varieties of living entities were existing. It is not that some of them have become extinct. Everything is there; it is due to our lack of knowledge that we cannot see things in their proper perspective.