Full Idea
There are four kinds of living being in the universe: the heavenly gods, winged creatures that travel through the air, those that live in water, and finally those that go on foot on dry land.
Gist of Idea
The universe has four types of living being: gods, birds, fish, and land animals
Source
Plato (Timaeus [c.362 BCE], 39e)
Book Reference
Plato: 'Timaeus and Critias', ed/tr. Waterfield,Robin [OUP 2008], p.28
A Reaction
So while the original gods are a different order of existence, the famous Olympian gods are living beings, distinguished only by their power and their immortality.