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.
When giraffes walk, they move both legs on one side of their body and then both legs on the other side; this is unique to giraffes. However, they run in a similar style to other mammals, swinging their rear legs and front legs in unison. They can reach 55 km/h (35 mph) at full speed but only in brief spurts.
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.