Group Nap?

I see these guys around all the time, Ibis, always in groups, always pecking at the ground and generally minding their own business. 

When I went into a building that's what they were doing. But when I came out it looks like they were taking a group nap. Every one of those birds had its beak tucked under its wing. 

Except one. 

I guess he was the lookout. 

But he wasn't looking for me.  Or, from his side-eye glance I must have seemed pretty harmless cuz none of them budged when I walked by.

And, I just noticed, they are all on one leg.

Who knew?