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 Giraffes have hearts that are 2 feet long. 2  Giraffes sleep only five to 30 minutes every day. 3  Usually they stand up to sleep. 4  They only lie down if another giraffe can stand watch. 5  Giraffes can run up to 35 miles per hour.heir legs are 6 feet long and so are their necks. Giraffes have only two predators, besides humans, crocodiles and lions. Giraffes are most vulnerable when they are taking a drink at a watering hole. They have to spread their legs wide to lower their necks. In this awkward position, they are easy prey for predators.