Goldfinches on a feeder

I wonder where the birds all go
when the seed in my feeders is running low
and after I fill them back to the brim
the birds come flying back again.

I understand if the seed is low
that someplace else they must go
as what I have is an additional thing
to what they normally are eating.

But, how do they know when the feeders are full
what messaging system do they have
that they all come flocking back again
not just one or two but a whole lot more
eager to feast outside my door.

All different types of birds are there
do they all the same language speak
does each song though different sung
tell the same story to every one?

Ah, Mother Nature at her best
knows the secret of the birds
but she will not help to solve
one of her mysteries she has evolved.

Here they all come again
from the tiny wren to much larger birds
even those that are way to big
to balance themselves as they try to eat.

To me it is interesting
to watch them squabble over the seed
that some are so busy guarding the stuff
they never have the time to feed.

Others take one sunflower seed
and speedily depart to the nearest tree
to consume their bounty in relative peace
until they go back for more to feed.

And so it goes day after day
I find it amusing in my own way
and try to keep the feeders filled
so that bored, I can never say

These tiny birds are a pleasure to watch
as they go about their work
to them they simply need to eat
in order for them to survive
so the act of filling up the bowls
is my way of saying thank you to them
for all of the pleasure they do show
as I sit and watch them over again.