First, despite some special areas, the equator is the highest temperature place in the world, which is more suitable for ants to survive.
Due to the hot weather near the equator, many insects are relatively large in size, because such an environment is more suitable for their growth and development. Many times insects prefer heat to cold. The hotter the environment, the better they grow. For example, the famous Australian bull ant is the largest ant species near the equator, but although it is the largest, it looks not as big as the red-headed ant in the northern hemisphere because of its long limbs. But it is recognized as the largest ant.
Second, there is plenty of food near the equator, so it is not easy to go hungry.
If you have something to eat, you can ensure that you grow well. There are many species near the equator, whether herbivores or carnivores, there will be no shortage of food. Especially when ants in other areas are thinking about how to spend the winter, the equator doesn't even need much preparation because there is no winter. In such a natural environment, it will naturally grow up. After all, with enough food, it will naturally grow up.
Third, there is enough water near the equator, so ants can grow more easily.
Animals need a lot of water to grow. The equatorial region is suitable for all kinds of animals because of its good water circulation. Of course, it also includes ants, which feed on the corpses of other animals. The reason why the equatorial region is full of water is that the air is humid, so that most insects will not stay away for a long time and exercise less, which indirectly makes them have a better life. Fat? Opportunity.
So the ants on the equator are not only bigger than those in the northern hemisphere, but also the ants in South Africa are not as good as most ants on the equator. Even gold-eating ants in the desert are not as big as cattle ants in Australia.