When there is overpopulation it means that more compettition over food. And sometime there will not be enough food for all of the animals. So, I think overpopulation can cause evolution, because the animals will have to change how they adapt. They might have to find different ways to find food. 
  When this happens they start to change and become more like other ones.
That is what evolution is, when  animals start to change and become more like other animals. This process happens over time. So, I am pretty sure that it would take thousands of years for animals to evolve.

In science class a couple of days ago we made a paper pet family. We got this blank printer paper and glued monster looking cutouts onto it. The cutuouts had all of their genotypes and phenotypes on the back. What are genotypes and phenotypes?
       Well genotypes are the the traits you get from each parent for a certain characteristic. Say you have wavy hair, well wavy hair is a dominant trait ,so you genotype is either Ww or WW. Also if you have straight hair then that is a recessive trait and your genotype is ww. Your phenotype is what you physically look like. I don't get these two words mixed up because phenotype and physical have ph in the front of them, and genes and genotype have gen in front of them. 
          This project helped me understand more about genotypes and phenotypes. I know about dominant traits and recessive traits. I also understand genotypic ratios and phenotypic ratios. This was a fun way to learn about genes instead of just reading the textbook.