This was the CO2 detector. The smoke detectors also hit end of life within a 6 month period.

I'm still trying to calm my anxiety. Triggered by waking up to beeping and spending over 30 minutes trying to get a thin metal clip into slots I can't see well, while it beeps.

I'll have what she's learning.

I haven't seen them go for a long distance, but have seen them roost in cottonwood trees. They can go vertical.