Good freakin question!

We have a covey of mourning doves here in our trees, that pig out
on our feeders. We watch them do the pecking order, males chasing
the females; and, we see them pork a couple times a season.

We do see "younger" looking doves, but they are simply 7/8ths version
of the adults, a little sleeker, not quite as colorful, and are last in line
in the pecking order to the dominant males...but never any little doves.

I'm with TQ2K's wonderment in regards to all the pesky, "pesty" species
"not being necessary". Otoh, controlling pigeons in metro areas is a full
time job. Import a few hawks or peregrine falcons to the bridges and they
will put a hurt on the pigeon pop.