Limiting factors are things that prevent a population from growing any larger. For example, 10 rabbits may live in a habitat that has enough water, cover and space to support 20 rabbits, but if there is only enough food for ten rabbits, the population will not grow any larger. In this example, food is the limiting factor.
Food is not the only factor that may limit population
growth. For example, there may be enough food to support a thousand birds
in a certain area, but only suitable nesting sites for one hundred. Or
perhaps there is plenty of food, water, cover and space to support a larger
population of pheasants in an area, but predators are the limiting factor.