The knowledge of attacking or retreat is not only for known for monkeys. Monkeys also know how to calculate which is hardwired into evolution. The basic operations such as addition and subtraction can be easily performed by monkeys.

A study made by German university showed monkeys can calculate. The monkeys can not only calculate but also act on basis of calculation. The monkeys when trained can recognize the number of dots and recognize the subsequent dots.

The dots recognized can also be compared by the monkeys. The monkeys are able to compare the dots and find the difference. Monkeys are capable of making final decisions based on the result. The monkeys are revealing that even they have logical minds like their human brothers.