How do the descriptions in the passage show that a hurricane is about to happen?

There are several signs that show that a hurricane is about to descend upon the region.
First, the animals are showing obvious signs of alarm. They display agitation and unease. Additionally, creatures that usually remain hidden during the day are out in full force. There are land crabs, cockroaches, and red ants crawling freely on the open terrain. Usually, roaches and red ants stay in protected, cool places during the day. Land crabs are generally nocturnal creatures as well.
Scientific studies have shown that many insects begin to mate frantically before an approaching hurricane, as if sensing that they have little time to build up their populations. This explains the frantic behavior of the insects on open ground.
Meanwhile, the text also tells us that the usual lizards and mosquitoes are nowhere to be found. Although there is no mention of strong winds at this point in the passage, it's a well-known fact that most mosquitoes and lizards don't survive hurricanes. This is because extremely strong winds tend to annihilate these creatures in large numbers.
Finally, we also learn that the pigeons are gathered on the roof. Many birds take shelter in place or prepare to leave the area before a hurricane. Although the text doesn't tell us what the pigeons end up doing, their agitated behavior shows that a large storm is on the way.
https://www.forbes.com/sites/grrlscientist/2017/09/08/where-do-birds-go-in-a-hurricane/

After the earthquake in chapter 3, the author states on page 42 that "the earthquake had done little to clear the air" and that the animals were acting strangely, "as if they had wind of something." The lizards and mosquitos that usually populated the plantation were replaced by what the author calls "Earth's most horrible progeny": crabs that wandered aimlessly and pigeons, gathered in groups, that talked to each other in fearful tones.
In addition, the weather is hot and oppressive. For example, the children gather in the shadows. They want to run out and grab a handkerchief that Mr. Thornton had dropped, "but none of them felt the energy to go and retrieve it."
Finally, a thunderstorm arrives, and the children are angrily told to get back into the house.

"Go back! Go back, you damned little fools!" he yelled furiously: "Get into the house!"