It is a basic ability for humans to tell more from less. 1 , a number of animals have this ability, too. They will choose more of something. Horses, for example, will go for a group of 2 apples instead of three apples.
The ability is 3 to animals in lots of ways. It helps them 4 the larger group of friends. Many fish, for example, join groups for 5 . If a predator (掠食动物) comes, a fish in a group of 40 is less possible to become lunch than a fish in a group of 10. So if a fish has a choice between two groups, it's safer to join the 6 one. A sense of number even helps keep the 7 . For example, a monkey group will avoid fights with other groups 8 they find their number is not an advantage.
Also, the ability to do simple 9 is a sure thing for some animals. They can 10 the difference between one, two and three. Some others can count much higher than three.
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