In the Spiritual world of eternal bliss, resides Vishnu as Anantha Padmanabha.
Brahma is born on the lotus umbilical chord of Vishnu- Padma Nabha.
(Each one of us are born this way as Brahma, from
Our Mothers,
as Brahma-creators of our world)
From time to time,
A set of souls wishes to leave to spiritual world to fulfil their desire to be the Creator, denoting the free will of the soul.
Vishnu facilitated this desire buy Creating A Loka that we are in today.

Brahma, after creating the Gods and Demi Gods, created creatures to fill the world, on Land, in the air and under water through Prajapathis- the masters of creation, the Chief of them being Daksha.
One of the Prajapathis Kashyapa who married 16 of Brahmas daughters, created the Six main group of Species as follows:
Species

1. Aquatics - 9 lacs - 10.71%
2. Plants - 20lacs- 23.80%
3. Insects and reptiles -11 lacs. - 13.09%
4. Birds -10 lacs- 11.90%
5. Animals -30 lacs- 35.71%
6. Humankind -4 lacs - 4.76%
Total 84 lacs species. -
Today science confirm the following and see how close they are to the ancient wisdom.

SPECIES OF THE EARTH
To date, a total of 1.3 million species have been identified and described, but the truth is that many more live on Earth. The most accurate census, conducted by the Hawaii's University, estimates that a total of 8.7 million species live on the planet.May 20, 2018
The species are created to balance and sustain each other. There is a purpose for every being in this universe.
Humans are just 4.76 % as the most evolved form of species.
If we miss out to realise oneself as one in that Spiritual world of Supreme Consciousness, the soul lingers in this cyclical world of birth, life and death.
This is the secret of creation.