User:ME PRERIT/sandbox

In easy language definiton, we can say number sense is not the ability to count, but the ability to pick out that something has changes in a small aggregation. Most of the organisms have this sense they understand the change in numbers of their young-ones. Researches have shown that apart from mammals, birds have also developed a good number sense; if a nest contains four eggs, one can safely be taken, but when two are removed the bird generally deserts. The bird can distinguish two from three.