They didn't slam into it, as if wanting to pass thru. Nope. They hovered, pecking at the glass.
First one, then two, then four at once.
What were they thinking?
"Hmm, I'll bet there are some tasty worms and berries in there to stock up on for the flight south, Eugene. I already tried to get in there once, but something invisible and solid is blocking the way. We'll have to get reinforcements. Fred? Mabel? You guys in with us?"
Odd.
