Wiki defines a lawn very well indeed - link
is an area of land planted with grasses ... which
are maintained at a short height and used for aesthetic and recreational purposes. Common
characteristics of a lawn are that it is composed only of grass species, it is subject to weed
and pest control, it is subject to practices aimed at maintaining its green color, and it is
regularly mowed to ensure an acceptable length ."
Note the absence of any mention of nature, natural or wildlife and note the use of poisons (weed and pest control).
As we can see, again from Wiki, the lawn is essentially a relatively modern, status symbol...
In the early 17th century, the Jacobean epoch of gardening began; during this period, the
closely cut "English" lawn was born. By the end of this period, the English lawn was a symbol
of status of the aristocracy and gentry; it showed that the owner could afford to keep
land that was not being used for a building, or for food production.