Question: How is the bat made to fly?
About the article "The Dark Knight Rises", section "Production design".

Candidate passages:
According to a particular East Nigerian tale, the bat developed its nocturnal habits after causing the death of his partner the bush-rat.
The bat and the bush-rat would share activities such as rummaging through the grass and trees, hunting, talking and bonding during the day.
When at night, the bat and the bush-rat would alternate in cooking duties, cooking what was caught, and eat together.
It appeared to be a dedicated partnership, but the bat hated the bush-rat immensely.
The bush-rat always found the bat's soup more appetising, so when eating dinner one night, asked the bat why the soup tasted better than his own and also asked how it was made.
The bat agreed to show him how to make it the next day, but instead was forming a malicious plan.
Next day as the bat prepared his soup, the bush-rat came, greeting him and asking if he could be shown what was agreed yesterday.
Earlier, the bat had found a pot looking exactly like the one he used usually, but it held warm water and so decided to use this instead.
The bat explained to the bush-rat that to make his soup, he had to boil himself prior to serving the soup, where sweetness and flavor of the soup came from the flesh.
The bat jumped in the pot seemingly excited, with the bush-rat mesmerised.
After a few minutes the bat climbed out and while the bush-rat was distracted, switched pots.
The bat then served his soup out of the soup pot, both tasted it.
Overanxious and eager, the bush-rat jumped into the pot of warm water.
He stayed much longer in the pot, dying in the process.
When the bush-rat's wife returned that night to find her husband dead, she wept and ran to the chief of the land's house, telling him about what happened and what she was sure the bat had done.
In hearing this, the chief became angry, ordering for the immediate arrest of the bat.
It just so happened that the bat was flying over the house and overheard what was just said.
He quickly went into hiding high up in a tree.
When the chief's men went looking for the bat, he could not be found.
The search to arrest the bat carried on over several days, but he still could not be found.
The bat needed to eat, so he flew out of hiding every night to hunt for food to avoid being arrested.
This, according to Eastern Nigeria mythology, is why bats only fly at night. 
The Fly River Roundleaf Bat (Hipposideros muscinus) is a species of bat in the family Hipposideridae.
It is found in West Papua, Indonesia and Papua New Guinea. 
<poem>Twinkle, twinkle, little bat!How I wonder what you're at!Up above the world you fly,Like a tea tray in the sky.
Twinkle, twinkle, little bat!How I wonder what you're at!</poem> 
During the countdown a bat was seen to be resting on the external tank.
What was originally believed to be a fruit bat was revealed to have been a free-tailed bat that clung onto the fuel tank during the launch.
NASA observers had believed the bat would fly off once the shuttle started to launch, but it did not, and it was probably shaken off and incinerated by the rocket exhaust.
A bat doctor, analyzing pictures, believed the bat had a broken wing which made it unable to fly off. 
The Common Nighthawk is sometimes called a "bull-bat", due to its perceived "bat-like" flight, and the "bull-like" boom made by its wings as it pulls from a dive.
Another name is "goatsucker", from an archaic, erroneous idea that the birds would fly into barns at night and suck dry the teats of goats.