On Greenfinches

As green as the leaves in Summer on a tree
Bird i do know but nowadays seldom does see
In Winter in small flocks they search for fallen seeds on the ground
Birds in large numbers never known for to abound
The males than the females a far richer green
Greenfinches are birds never easily seen
Like their cousins goldfinches introduced from Europe in Seasons long gone
The wheezy low toned song of their ancestors in today's greenfinches living on
In Spring as the males fly they sing in butterfly like courtship display
To seduce the female this is the male's way
Every individual bird species have ways of their own
And so much of Nature's ways to human kind remain unknown
And greenfinches birds i do not see every day
I know of but know little about in truth i can say.