The population is empty because it is just the camp and the poachers that are hunting the animals. If somebody was to get hurt it would be a 2 hour flight to the hospital or some population.
Some objects are the smartphone, radio, jeep. This helps because some of the objects weren't made in the early 1900s or early.
The mood of the book is dark in places when the go back to the scene of when Sarah's mom had died. There is also happy thoughts when joey is petting a porcupine and not afraid of it.