No disclaimer, but this is actually a portrayal of timelines and how the incarnations of Vishnu came to this earth during different phrases and taught us into becoming advanced than we already were. While the Theory Of Evolution itself is not widely accepted but very famous, Let us for a change know what it is about in a nutshell.
“Scientists think that life first started on earth nearly four billion years ago. Once it existed, the theory of evolution seems to explain what happened next. Over billions of years, life gradually evolved, from simple creatures to what we have today.”
Well, That was it. The more detailed you wish to get, the more number of articles you will probably find on net. The two points here are: Evolution and Passage of Time. Creatures evolves as time passed by.
Modern Interpreters categorizes the 10 avatars of Vishnu in a sequence of the evolution of Human beings, more specifically from a simpler organism to a complex organism. Interestingly and fortunately, this observation found its way into the papers thorough the hands of a non-Hindu and a Non-Indian. Theosophist Helena Blavatsky in her 1877 opus Isis Unveiled, in which she proposed the following ordering of the Dashavataras.
Matsya – fish, the first class of vertebrates; evolved in water(Indicates origin of Fishes in Silurian Period
Kurma – amphibious (living in both water and land; but not to confuse with the vertebrate class amphibians)(Indicates origin of Amphibians in Devonian Period
Varaha – mammals, wild land animals (Indicates Mammals origin in Triassic Period
Narasimha – beings that are half-animal and half-human (indicative of emergence of human thoughts and intelligence in powerful wild nature)
Vamana – short, premature human beings
Parasurama – early humans living in forests and using weapons
Rama – humans living in community, beginning of civil society
Krishna – humans practicing animal husbandry, politically advanced societies
Buddha – humans finding enlightenment
Kalki – advanced humans with great powers of destruction.
“This interpretation was taken up by other Orientalists and by Hindus in India, particularly reformers who sought to harmonize traditional religion with modern science. Keshub Chandra Sen, a prominent figure in the Brahmo Samaj and an early teacher of Swami Vivekananda, was the first Indian Hindu to adopt this reading. In an 1882 lecture he said:
The Puranas speak of the different manifestations or incarnations of the Deity in different epochs of the world history. Lo! The Hindu Avatar rises from the lowest scale of life through the fish, the tortoise, and the hog up to the perfection of humanity. Indian Avatarism is, indeed, a crude representation of the ascending scale of Divine creation. Such precisely is the modern theory of evolution.
Similarly, Monier Monier-Williams wrote “Indeed, the Hindus were … Darwinians centuries before the birth of Darwin, and evolutionists centuries before the doctrine of evolution had been accepted by the Huxleys of our time, and before any word like evolution existed in any language of the world.” J. B. S. Haldane suggested that Dashavatara gave a “rough idea” of vertebrate evolution: a fish, a tortoise, a boar, a man-lion, a dwarf and then four men (Kalki is not yet born).Nabinchandra Sen explains the Dashavatara with Darwin’s evolution in his Raivatak. C. D. Deshmukh also remarked on the “striking” similarity between Darwin’s theory and the Dashavatara.” (Content credited to: Wikipedia Direct Link)