Everybody's long necking today

I got six "new" hand-me-down layer hens last night.  They traveled quietly and stowed easily into the coop.This morning, they came down the ramp looking around with their necks at maximum extension.  What? Is this where we live?  Where are we?  They walk around slowly, lifting their feet high and setting them down cautiously. And the home girls are long necking at them. Who are THEY?  Where'd they come from?  Harumph. Everyone is very suspicious, and the roosters are very busy taking charge.