Why were my grandfather's chickens bigger than mine?

I don't understand...  

good grief where did you find that picture?!?!?! so funny, laughed out loud. Maybe we are just shrinking and they are shrinking with us. atmospheric or something . . .

  Great picture. Thanks for sharing.

I think your Grandfather was just shorter than you. You know people didn't get as tall back then.

Wonder how he broke it to plow???

I believe I could have trained one of my old isa browns to rob a bank with grasshoppers as treats, maybe it is that simple - a treat dangling right in front of the beak to make it walk on. even better, a mouse - hate to be the farmer trying to keep up with a chicken after a mouse dangling right in front of it's beak.

LOL, my wife found the picture on facebook. It tickled me pink!

Is that a Buff Columbian Rock Chicken your Grandpa is on?
  

Ha, I was wondering...does look like doesn't it?