No one survived a plane crash. When experts arrived at the scene, everything was destroyed and it was not possible to

No one survived a plane crash.  When experts arrived at the scene, everything was destroyed and it was not possible to find out the cause of the accident.  A monkey was perched on a tree near the wreckage, with an airline tag hanging around its neck. 

 It turned out that the monkey was also a passenger on the wreck.  He was caught.  A sign language expert was hired, so he could talk to the monkey and find out something!

 The Board of Inquiry questioned the monkey through an expert,

 "What time was the accident?"

 The sign language expert explained the question to the monkey, the monkey heard the question and pointed to his wrist, then raised ten fingers of both hands, then he folded both hands and placed them on his cheek and tilted his head.  Taken

 Experts understand the signal and say, "The monkey is saying the accident happened at ten o'clock at night."

 The board of inquiry asked the next question, "What were the passengers doing at the time?"

 The monkey then placed both hands on his cheeks and tilted his head. The expert then said, "The monkey is saying that the passengers were asleep!"

 What were the air hostesses doing?

 "She was sleeping," said the monkey.

 Investigators asked, "What was the pilot doing?"

 Shutting down, he replied, "I was sleeping."

 One of the investigators asked the monkey, "What were you doing when everyone was asleep?"

 The monkey waved both hands and gestured, "The plane was moving."