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.
1 A giraffeâs heart can weigh 22 pounds (10 kg) and measure up to two feet (60 cm) long. 2  Giraffe sleep between 3-5 hours a day in short intervals of 12-15 minutes.  The pattern of spots on every giraffe is unique â like human fingerprints.