1. Measuring Population By Wilj Rosd Ducn

2. Direct observation The size of a population, when you count how many are in a group and you count them one by one. When I am in the mountains and looking at deer there are a lot of them in one group.

3. Indirect Observation It is a simple way to see how many are in a area of one population. I have dog houses and there is two dogs per dog house and there are 20 dog houses you can find out how many dogs are in that population

4. Sampling Estimating by counting a small area of a population then multiplying it by the total population to get an estimate for the amount the population is. I count 5 dogs in one area of the dog park and multiply it by 4 for the other parts of the park and estimate that there is 25 dogs at the dog park.

5. Mark and recapture Capturing part of a population and marking them. Then letting them go and recapture some more of the population 2 weeks later. Count how many of them are marked and use a mathematical formula to calculate the population of the species. I release a marked turtle and don’t recapture it 2 weeks later, but I capture some marked and some unmarked ones.