Giraffe

Giraffe's necks vary in length. Since the Giraffes with longer necks find it easier to get food, the short neck ones don't survive as well, making Giraffes with long necks more common place. Giraffes also differ in weight and size naturally, and of course, no two Giraffes have the exact same spots.
Since these animals are native of Africa, and run wild in the tall grasses and open planes, they would live alongside any other animals that share the same resources as them, such as rhinoceroses, and elephants, or even other populations or herds of giraffes.
The type of relationship that giraffes have with tick birds or ox peckers is mutualism. The bird eats all the ticks and mites that get on the giraffe, preventing it from getting sick and the birds get fed. Both benefit.
Giraffes were designed to live in the plains or woodlands of Africa because of its long neck for eating high up trees and its need to have space to maneuver. Giraffes are also extremely fast and the plains give them space to run.
Giraffes use sexual reproduction. Males take part in establishing social hierarchies by "necking" (using their neck as weapons.) The males that win gain access to the females, which are the sole caretaker of their offspring. Older males mate with fertile females, and they assess their fertility by tasting the female's urine to detect oestrus. Giraffes reproduction is polygamous which means they have more than one breeding partners.