Yes, I'd see Sriram's concept of spiritual evolution - a progression from a base nature through successive reincarnations towards a higher nature - as a metaphor for distancing us from our (distasteful) animal nature. I'd see this as an Eastern equivalent of the Judeochristian doctrine of salvation which could be seen as a metaphor for our being rescued from our animal nature and blessed with a divine nature instead. I think it one of humanity's deepest psychological discomfitures to recognise our animal nature, we'd really rather forget about it, it is a source of embarrassment and humiliation. Many old world religions (and new ones) are popular because they act as constructs to serve our twin denials (the other being mortality).
torridon,
Hinduism is probably the oldest 'religion' and philosophy that recognized the continuity between animals and humans. Hindus are not against nor antagonistic to animal life. Vegetarianism, respect for animals and other forms of life, ecological interdependence and so on are ingrained in Hindu life. Much of it is being recognized by the western world only now....who have otherwise treated animals as only accessories.
I have also mentioned many times the uncanny parallel between the Dasavatars and the Theory of Evolution.
(For those who haven't read that, it is available at
https://tsriramrao.wordpress.com/2012/07/03/evolution-and-spirituality/ )
We believe that all humans were earlier born at various levels in the animal world as part of their spiritual development. It is a spectrum with the lowest forms of life at one end and humans at the other. Even among humans there is a spectrum with some near the animal level and some near the Divine level.
Our consciousness has developed only through this process. We cannot and should not go back to a lower level of consciousness...or equate ourselves with that.
It is like different classes at school. Once you are out of the primary school, you should stop behaving like primary school children. Merely because you were at one time a child you cannot continue to behave like one.
Hindus are not embarrassed of their animal past. Its all about moving forward instead of continuing to take our cue from the animal world. Continuing to associate with our earlier levels of consciousness is wrong and is considered as bad karma because it goes against the natural flow of life and its development.
So, the relationship of humans to animal life is nothing new in Hinduism and it was understood as a normal part of day to day life long before Charles Darwin. Spirituality is about developing and moving further.
Cheers.
Sriram