Population ecology is the study of these and other questions about what factors affect population and how and why a population changes over time. Population ecology has its deepest historic roots, and its richest development, in the study of population growth, regulation, and dynamics, or demography.
While running, the neck of a giraffe moves backward and forward to keep the animal balanced. Giraffes have a top speed of about 56 kilometres per hour (35 miles per hour), however, because its legs are so long a galloping giraffe does not appear to be going very fast.
Giraffes are capable of running at speeds of up to 35 miles per hour for a short period of time and can travel longer distances when moving at around 10 miles per hour. A giraffe's ability to run quickly is due to the fact that they have long legs that are well suited to traversing the tough African landscape.