[citation needed] Mark and recapture is a common form of data collection involving species with large populations.
Being able to capture and mark a species in a noninvasive way allows for accurate readings of the population's size, both total and effective over several rounds of recapture.
[1] Once considered costly, modern advancements have allowed for non-invasive data collection to become easier and provide more genetic information about a population.
This creates a negative statistical bias, pushing the results towards a smaller, less genetically diverse mean than is accurate to the population.
Existing primarily in Portugal, populations can be difficult to estimate using typical mark-recapture methods due to their small size and ability to quickly disperse over large swaths of prairie land.