GEOGRAPHIC SEPARATION OF GORILLA SPECIES
FIGURE 4.18 The western gorilla (Gorilla gorilla) and the eastern gorilla (Gorilla beringei) are separated by more than 1,000 kilometers (620 miles). As shown, both gorilla species have further differentiated into two subspecies.
(Ronald van der Beek/Shutterstock) (Ryan M. Bolton/Shutterstock) (Nickolay Khoroshov/Shutterstock) (© Orokiet/Alamy)