Closely related species often live side by side, although according to the opinion prevailing among

Closely related species often live side by side, although according to the opinion prevailing among Darwinists there is the strongest competition between them. Why does not one of the species crowd out the other?

Closely related species most often do not crowd out each other, even with very strong competition. This is due to the fact that there are limiting factors from the outside.

For example, over competing species may be the same third, which is physiologically stronger and capable of suppressing them.
In another case, competing species can switch to different conditions of existence, that is, eat different food, get it in different ways and lead an active lifestyle at different times of the day.
The resource for which one is competing may become too much at one point.