Today in class, we learned about population pyramids. Population pyramids look like horizontal bar graphs that compare the ages of males and females. They analyze population growth or decline of fertility, mortality, migration, etc. Each bar goes by 5 years and the ages are grouped into kids, economically active, and the elderly. There are three types of population pyramids. The first one is shaped like a Christmas tree. This means that this country or nation is a developing nation that has a high birth rate and a short life expectancy. Examples of a Christmas tree population pyramid would be the population of Namibia or Bangladesh. The second shape is a box, which means the nation is developed with slow population growth, low infant mortality rate, and a long life expectancy. An example of a box shaped population pyramid would be the USA or Sweden.