why might it be unsafe for bats to roast on the ground
One reason why it might be unsafe for bats to roost on the ground is because of predators. It would make them more vulnerable.
on the ground
yes ye they do
birds and bats
some may but its not commen
For ground animals - nothing much. For flyers (birds, bats) the big blades kill a certain number. How many is open to question.
they might have it
no some species of bats might
They fly and when they have a hurt wing they walk on the ground
Woodchucks, ground squirrels and bats are true hibernators.
Air Pressure
no but fruit bats might