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 have different features that help them stay safe from predators. For one thing, they are fast, tall, and very strong. This means that it does not have many enemies. The major predators of the giraffe are hyenas, Nile crocodiles, and lions. With the help of its speed, a giraffe is able to get away from such predators. A giraffe can run close to 30 mph and this makes it easier to escape its enemies. However, the giraffe can only keep up with this speed for a short distance.