Final answer:
More than 25% of the nation's mammals are at risk of extinction. Habitat destruction and overexploitation are among the major threats to these mammal species, and conservation programs are in place to mitigate the loss of biodiversity.
Step-by-step explanation:
Overall, more than 25% of the nation's mammals are extinct or threatened. This alarming statistic is supported by global assessments such as the one conducted by Schipper et al. in 2008, which didn't differentiate between imperiled and non-threatened species when reporting on threats - and yet found that habitat destruction, overexploitation, and other factors seriously affect a significant portion of mammal species. The International Union for the Conservation of Nature has classified more than 6,000 vertebrate species as threatened, including 29% of all amphibians and 21% of all mammals. Conservation efforts such as the Biodiversity Action Plan are ongoing to combat this crisis.