Which group of states is generally indicated as lacking large, continuous river otter populations due to aridity?

Answer

Arid Southwestern states like Nevada, Arizona, and New Mexico

Populations are generally noted as being absent from arid Southwestern states such as Nevada, Arizona, and New Mexico, highlighting their dependency on permanent, year-round aquatic habitat.

Which group of states is generally indicated as lacking large, continuous river otter populations due to aridity?
habitatwildlifeUSAdistributionriver otter