Measuring an animal population that moves around

Question 1

How can we measure an animal population that moves around?

Answer 1

By using the capture-recapture technique

Question 2

Name 5 ways that the capture-recapture technique works

Answer 2

~Capturing a number of individuals from a species
~Marking them
~Releasing them back into the wild
~Some time later another sample of the species is captured
~Using a mathematical equation to estimate the population