The US Fish and Wildlife Service hired you to help identify animals that people transport illegally. Several small rodents with big ears, short fur, and hairless tails were inside an airline passenger's suitcase at LA International Airport. The animals are still alive, and you hope to get them returned to their native habitat. To focus your search for the species identity and whether or not it is endangered, in which habitat species ID field guide should you research or which US Fish and Wildlife Office should you contact?
30°N latitude, possibly behind a rain shadow
High altitude temperate forests in the Sierra Madre Mountains
A field research station along the equator in Panama
60°N latitude in temperate rainforests of the Pacific Northwest and Northern California