Camel

Camels live in hot deserts.

They have big humps on their backs. These humps store fat for later. This fat helps when food is hard to find.

Camels have wide feet. This helps them walk on sand. They also have long eyelashes. These keep sand out of their eyes.

People use camels to carry heavy things. They can also give milk and hair. Camels are very useful animals.

Camels are amazing animals built for life in the desert.

They have special parts that help them survive. Most people think humps store water. But humps actually store fat. This fat gives them power when food is scarce.

If a camel uses this fat, its hump might look limp.

Camels are very good at saving water. Their red blood cells are oval instead of round. This shape helps the blood flow even when the animal is thirsty. They also have a special way to stay cool. They have a rete mirabile, which is a group of veins and arteries. This part helps keep their brain at a safe temperature.

There are three types of camels. The dromedary has one hump. The Bactrian camel has two humps. There is also a wild Bactrian camel. These animals are very useful to people. They carry heavy cargo and passengers. People also use them for milk, meat, and hair.

Camels are amazing animals built for life in the desert.

They belong to a group called camelids. This group includes true camels and animals like llamas and alpacas. Camels are very helpful to humans as livestock. They provide milk, meat, and hair for textiles.

People also use them to carry heavy cargo and passengers. They are strong working animals in many parts of the world.

Many things help a camel survive in hot, dry places.

People often think humps store water, but they actually store fat. This fat provides energy when food is hard to find. A camel can also drink a lot of water at once. This water is stored in the bloodstream, not the hump. Their red blood cells are oval instead of round. This shape helps the blood flow easily even when the animal is thirsty.

These special traits allow them to live where other animals might struggle.

Camels have many ways to stay cool and save water.

Their thick coats protect them from the intense desert heat. In the summer, their hair becomes lighter to reflect sunlight. They also have long legs to keep their bodies away from hot sand. To protect their eyes from sand, they have long eyelashes and a third eyelid.

When they breathe out, they trap water vapor in their nostrils. This helps them reuse moisture instead of losing it to the air. Their kidneys are also very efficient at saving water for the body.

There are three different species of camels living today.

The dromedary has one hump and makes up 94% of all camels. The domestic Bactrian camel has two humps and makes up 6%. There is also a wild Bactrian camel that is critically endangered. There are fewer than 1,000 of these wild camels left in the world.

Dromedary camels can weigh up to 660 kilograms. Bactrian camels can be a foot taller than the dromedary. Some camels can even run in short bursts at high speeds.

Camels have a very long history that began in North America.

The earliest known camel was called Protylopus. It lived 40 to 50 million years ago and was only the size of a rabbit. Later, an ancestor called Paracamelus moved from North America to Asia. This happened about 6 million years ago by crossing a land bridge. Eventually, humans began to domesticate them. Today, they remain a vital part of life in many desert regions.

Camels are even-toed ungulates belonging to the genus *Camelus*.

They are best known for the distinctive fatty deposits on their backs called humps. These animals are vital to human civilization as livestock and working animals. They provide essential resources like meat, milk, and textiles made from their hair.

Beyond food, they serve as a primary means of transport for passengers and cargo in desert environments. They belong to the broader family Camelidae, which includes the "New World" camelids like llamas and alpacas.

Many people believe that camel humps serve as water reservoirs.

However, the humps actually store fatty tissue used as a reserve source of calories. When a camel uses this fat during food shortages, the hump becomes limp and droops. While metabolizing this fat yields a greater mass of water, the process requires oxygen. This respiratory process causes water to evaporate from the lungs, resulting in a net decrease in water. To survive without external water, camels have developed remarkable physiological adaptations. They can drink as much as 113 liters of water at a single time. This water is stored in the bloodstream rather than the humps.

Camels possess unique biological traits to handle extreme dehydration.

Unlike most mammals, their red blood cells are oval rather than circular. This shape facilitates blood flow during dehydration and prevents cells from rupturing when the animal drinks large amounts of water. They can also withstand losing up to 30% of their body mass due to dehydration. Most other mammals may face cardiac failure after losing only 12% to 14% of their body weight. To protect their vital organs, camels use a rete mirabile. This is a complex of arteries and veins that utilizes countercurrent blood flow to cool the blood moving to the brain.

Temperature regulation is another critical survival mechanism.

A camel's body temperature fluctuates from dawn until sunset. Their thick coats insulate them from the heat radiated by desert sand. In the summer, their coats become lighter in color to reflect sunlight and prevent sunburn. Their long legs also help by keeping the body far from the hot ground. When they lie down, a thick pad of tissue called a pedestal raises the body from the surface. This allows cooling air to pass underneath them. They also rarely sweat, and when they do, the moisture evaporates at the skin level.

There are three surviving species of camel in the world today.

The one-humped dromedary makes up 94% of the global camel population. The domestic two-humped Bactrian camel makes up 6% of the population. There is also a third, distinct species known as the wild Bactrian camel. This species is not ancestral to the domestic Bactrian camel and is now critically endangered. There are fewer than 1,000 wild Bactrian camels remaining.

Dromedary camels can weigh up to 660 kilograms, while Bactrian camels are often a foot taller.

The evolutionary history of camelids began in North America during the Eocene epoch. The earliest known ancestor, *Protylopus*, lived 40 to 50 million years ago and was only the size of a rabbit. About 6 million years ago, an ancestor called *Paracamelus* migrated from North America to Asia via the Bering land bridge. This migration allowed camels to spread into the Old World. The split between the tribes that led to modern camels and llamas occurred over 16 million years ago. Eventually, humans domesticated these animals, spreading them globally for work and food.

Camels also exhibit unique anatomical features for desert life. Their mouths have a thick, leathery lining to protect them while chewing thorny plants. To defend against sand, they have long eyelashes, ear hairs, and nostrils that can close. They also possess a translucent third eyelid, or nictitating membrane, to dislodge sand from their eyes. Their kidneys and intestines are highly efficient at reabsorbing water. Specifically, their kidneys have a 1:4 cortex to medulla ratio, which helps limit urine volume. Even their immune systems are unique, possessing small, durable "heavy-chain-only" antibodies that developed roughly 50 million years ago.