Giraffes eat mostly leaves from tall trees, which they can reach because of their long legs and long necks, as well as small insects. They can go without water for weeks.
Giraffes live alone or in loose groups. Young male giraffes form small groups until they become mature. Adult males live alone. Females form groups of 4–32 animals. When the female is close to giving birth, it leaves the group for a time to give birth to its offspring, and comes back 2-3 weeks after her baby is born.
After a pregnancy of 14-15 months, the female gives birth to usually a single baby (which is called “calf”). Giraffes give birth while standing, so the baby falls down 2 metres. Giraffe calfs are already 1.8 m tall and weigh 50 kg. The calf stays with its mother for 1½ years. Young giraffes become mature when they are 4 years old, and they are fully grown when they are 6 years old. Giraffes can become 25 years old, in captivity they can become 35 years old.
Several adaptations help a camel save water. When there is food and water, a camel can eat and drink large amounts and store it as fat in the hump. Then, when there is no food or water, the camel uses the fat for energy, and the hump becomes small and soft. A camel’s waste contains very little water. Even the water from the camel’s breath flows back into its mouth.
A camel has a naturally adapted thermostat – it can change its bodily temperature by six degrees Celsius either way. It has two sets of eyelashes, closing muscles in the nasal passages with slited nostrils, hairy ears and tough, leathery skin to protect the camels skin in vital emergencies such as a sandstorm. It has thick rubbery lips to eat dry, prickly plants and a large, haired tail to swat pests such as mosquitos and flies.
It has a long slender neck in order to reach high leaves such as palm trees, and rubbery patches on the belly and knees to protect the skin when kneeling and sitting on the hot sand. These form after five years of age.