Maybe sex for Homo sapiens is considered a casual past time, but that is not what finding a niche is what biologists refer to when they point out that niches will always be filled by some animal. True, copulation is required for all the animals on earth that have evolved with male and female, but it is evolutionists who explain that because of reproduction, species change within each niche. We know humans thought on this for thousands of years since recorded words tell us so. Controversy became more heated after Darwin, and others, directed our attention to how life develops from a single fertilized cell to this amazingly complex body we each call our own. Our technical inventions store past musings of learned, intelligent (?) writers and are available to all who search. So what about a niche?
Indeed, a niche is a place where life develops in the only way it can. That is if it adapts to the niche to begin with. An organism must have food before it can think of reproducing. Scratch the word think. That is not really important in the equation. There must be enough safety within a niche to allow the offspring to survive after they emerge, however they emerge and, from whatever animal. The niche must also provide food to sustain the offspring so it can continue to reproduce. In the context of the niche the fittest survive. Because they adapted to the environment. The biology sort of takes care of itself.
There are also niches within each society of animals. That is where humans misconstrue survival of the fittest. I keep looking for a niche where I best develop – skills and satisfaction. Trouble is, I find one and go on to add another. I like the fit of the niche but my day only can accommodate a limited number. Sooner or later I leave a niche behind. That’s O.K. Einstein came up with an equation showing that motion depends on time. So it all evens out. It’s not a case of my time is your time. My time is limited. So I choose the niches where I can give my all.