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.
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.