Comparison of the genetic diversity of the captive breeding population to wild populations is done to evaluate how the captive breeding program is retaining the population's genetic diversity over time. In a study done by McGreevy et al. (2010), “AZA Matschie tree kangaroo’s haplotype diversity was almost two times lower than wild Matschie tree kangaroos.” This difference with allele frequencies shows the changes that can happen over time like genetic drift and mutation when a species is taken out of its natural habitat.