When you have too many of one species or even too many different kinds it is called over population. This can be good and bad. Mostly bad though. Lets take moths for example, You have way too many living one  area. This can be harmful to the moths. Having so many in can make it harder for them to get food and find a place to live. Witch can lead to the population to die off. 
        After many years of overpopulation, the spices will begin t change so that they have a better chance of surviving. This is called evolution. One example Is the Tortoise  If the Tortoise lives on a wet area the neck will be rounder so that it can eat grass. But a Tortoise hat lives on a drier island its neck will have a slight turn-up so that it can reach up to higher plants and fruits. when an area is over populated the animal will slowly change to make it easier for them to live in the situation that they live in 



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