A Lesson From the Cuckoo Bird?

Is there an object lesson is to be had,
or story moral to be learned-
from the frightful tale of the
Cuckoo bird?

A bird that neither plans nor toils
its own nest to build, but seeks
the industry of its neighbor to exploit-
and in its nest an alien egg to lay.

An egg that is left by the Cuckoo bird-
to be brooded and hatched by foster parents-
and the illegal hatchling to be reared-
at the expense of their rightful own.

An illegal chick that displaces the rightful-
demanding food unceasingly day and night-
until the exploited foster parents usually die-
their vital resources totally exhausted.
It then leaves the foster nest and flies away-
this cycle of piracy again to repeat.