I have read comments about decoying birds and moving spots when you are field hunting. I am just trying to understand how this works?
:::Please keep in mind I have never Goose hunted and the first time I went ducking was only a couple weeks ago.( 
man thats fun )
The quote below is from another post that finally sparked my interest enough to ask.
Quote:
Some birds have been pressured and are hard to decoy. Switching fields and locations have been the key.
I do understand about them being pressured and hard to decoy but why move fields if it is a good spot?
I thought these birds were migrating south?(passing through)
So lets say you hunt on a Saturday and Sunday, I would think the birds on Sunday would be a different groups of birds due to the ones that came on Saturday have moved on. Or even the following Saturday?
Am I missing something? 
If they are getting pressured all the way down from Canada (getting decoyed and shot at)
If you have a good spot that you know birds come to wouldn’t it be more dependant on your decoy setup and your calls?
Thanks for your comments in advance!! 