I have great sympathy for whales, but I have never laboured under the illusion that I am one. Neither am I a forest-dweller or cavewoman. To pretend to be any of these would be absurd, and the moment of giving birth is no time to attempt pretension.
As a 20th-century, Western human being, I judge my 'natural environment' to be my own living room: for the birth of my second child I enlisted the help of an experienced midwife, invested in a large plastic sheet, and had the baby on the living-room floor. I'd recommend it.