There are many tree snails before it rains. When we see a large number of tree snails on trees, leaves or grass, we can conclude that it is going to rain. It makes sense for some people to regard tree snails as a barometer. Experiments show that the tree snail is not only outdoors, but also extremely sensitive to humidity when it is placed indoors and covered with a glass cover. Some species that are especially used to living in humid places will find their own environment if they are placed in a dry environment.
In addition, tree snails have many "special instincts".
Darwin once wrote an interesting story. Someone told him that two tree snails were found in an abandoned small garden without enough food. One of them is ill and it is difficult to move. At this time, the strong one immediately left his companion and quickly crossed the high wall to another food-rich garden. Soon it returned to its companion from another garden, and immediately went to that garden with its companion with rich food. Perhaps this record shows that it has a special instinct!
This habit of tree snails going home is sometimes particularly prominent. For example, a tree-planting snail hates the smell of coal tar, and it will bypass the coal tar field to find food. After eating the food, it will return to its original place of residence by the original road. Although it can easily find a more suitable new house where there is food, it has to climb back around the coal tar pile it hates.
Tree snails have strong vitality, cold resistance, heat resistance, drought resistance and hunger tolerance. When it is very cold, the activity of the tree snail stops, the heart beats slowly and enters the hibernation period. Generally, after autumn, when the weather gets worse and plant food decreases, tree snails climb to the bottom of rocks, caves in ancient walls, tree holes, crevices or underground seclusion. At that time, its body was completely shrunk into the shell, and the mouth of the shell was blocked by a white film secreted by its feet, so that it could spend the winter safely. Sometimes many tree snails gather together to hibernate.
In very hot areas, tree snails sleep in summer to spend the summer. Many tree snails are very heat-tolerant. For example, in Africa, some places are very hot, and even there are few plants, but there are tree snails living. In order to protect themselves and make them have great resistance to strong light and heat, tree snails have two ways to adapt: one is to make the shell white, which is the same as wearing white clothes in summer, because white things absorb less light and heat; The other is to thicken the shell, so that light and heat are not easy to invade.
Tree snails can survive for a long time without food at all. For example, on March 25th, 1846, scientists collected two tree snails from Egypt, returned to a British museum, glued them to a fixed board and kept them in a specimen room. However, when they were taken out on March 5, 2000 1850, it was found that one of them had a newly formed mucosa at the mouth of the shell. The scientist thought it was strange, so he took it off the board and put it in warm water. Soon its body came out of its shell. The next day, I ate some Chinese cabbage leaves, 1-2 months later, and I recovered when I removed the board. For nearly four years, it has neither food nor water, but it can live well. There are many examples that tree snails can live for 4-6 years under this condition. This is really a great thing. I'm afraid except some insects, other animals rarely have this ability.