I think the point behind the show is the demonstrate how animals begin to develop there instincts, for instance the puppy is shown to be panting in the womb. It takes through the development of the fetus.
You know, the only true instinct (in the real since of the word) that humans contain is suckling, so that's why you see a lot babies sucking their thumbs in the mother.
If the animals are not stressed it's a good way to emphasize that animals are alive, are creation, are important, are not really different...
Maybe the intention is to make people stop and think... and appreciate what is normally ignored and taken for granted.
Hmmm....
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