We know they're capable of passing complex information onto each other. What "a bad man's face" looks like for instance, I'm sure some of HN has seen the docume

We know they're capable of passing complex information onto each other. What "a bad man's face" looks like for instance, I'm sure some of HN has seen the documentaries on their abilities. I wonder if they choose nesting material based on insulation properties also. Cigarette stubs are probably great for stuffing into cracks and it is known that plugging air gaps dramatically increases whole house/nest insulation value.