Crime scene: 162 mystery solving puzzles to find out who the murderer is

Chapter 130

Tommy and George are very good friends, both of them are fond of hunting and exploring.Here's what they had to say about their summer expedition to South America that year.

In the morning, when they brought all their expedition equipment and went to the Amazon forest area, they wanted to explore the living habits of the local cannibals, but they were discovered by the cannibals.The cannibal immediately blew a silent flute for help, and the two fled immediately.

Walking and walking, the two walked exhaustedly. Later, when they looked back, there were no cannibals chasing them, so the two walked slowly to the Amazon River and waited for the boat to rescue them by the river.When they returned to the shore, they suddenly saw a group of cannibals rushing towards them from all directions, and captured them alive and brought them into the forest.After the young clansmen translated for them and asked about their purpose, they were released when they knew that they were here for an adventure and not to attack them.

Walking out of the forest, George thought to himself: "Why did the cannibals come to the river to capture us? How did they convey the news?"

Can you solve the problem for George?
[Answer] The cannibals mainly rely on the sound of the flute to convey information.Because the sound waves of these flutes are higher than those that can be heard by human ears, only dogs can hear them.They use this principle to hunt down Tommy and George.

(End of this chapter)