A camel’s hump is a mound of fat, not a water tank. It works like a packed lunch the camel can live on when food runs out. Keeping that fat in one spot instead of spreading it under the skin also helps the camel handle desert heat.1Encyclopedia Britannica. Do Camels Store Water in Their Humps? The hump may even have first evolved to get camels through long, freezing winters rather than hot deserts.2AccuWeather. Camels evolved from a cold-weather ancestor. We could learn from their remarkable transformation
What a Camel’s Hump Is Made Of
There is no bone or muscle in a hump, which is why it can grow and shrink. Inside, sheets of connective tissue split the fat into lobes of different sizes.3PubMed Central. Camel hump: composition, bioactivities, and multifunctional sustainable applications A strong, elastic web of that tissue holds the fat globules in place.4International Journal of Veterinary Science. Proximate Chemical Analysis, Fatty Acid Profile and Microstructural Characteristics of Dromedary Camel Fats (Hump, Renal and Mesentery) Each fat cell holds one big droplet of fat, the kind of cell bodies use for long-term storage.5PubMed Central. Camel hump: composition, bioactivities, and multifunctional sustainable applications
With no bone inside, the hump’s size shows how much fat the camel is carrying. A large hump can hold tens of kilograms of fat, enough energy to keep a camel going for many days.
Hump fat is mostly saturated fat, the solid kind, at roughly 55 to 68 percent of its fat content.6PubMed. Effects of age on fatty acid composition of the hump and abdomen depot fats of the Arabian camel (Camelus dromedarius)7PubMed Central. Comparative Analysis of Morphology and Targeted Fatty Acid Profiling of Adipose Tissues from Different Depots in the Junggar Bactrian Camel Even so, in Bactrian camels it carries more of the softer, unsaturated fats than the fat around the organs does.8PubMed Central. Comparative Analysis of Morphology and Targeted Fatty Acid Profiling of Adipose Tissues from Different Depots in the Junggar Bactrian Camel
Fat is also a smart way to carry energy. It packs about twice the energy of the same weight of sugar or protein, and stored sugar needs water bound to it, which makes it heavier still. For an animal walking long distances, light, compact fat makes sense.
Why the Fat Sits in One Place
Fat spread under the skin acts like a blanket and traps heat. By gathering fat into a hump, camels keep the rest of the body thinly insulated during hot days.9Encyclopedia Britannica. Do Camels Store Water in Their Humps? At night, the heat built up during the day escapes through that lightly covered body.10Encyclopedia Britannica. Do Camels Store Water in Their Humps? The hump on top also shades the back from the overhead sun.
Because little fat lies under the skin of the flanks, belly and legs, heat passes from body to air more easily there. That only happens quickly when the air is cooler than the animal, so the advantage matters most in the evening and at night.
Camels let their body temperature rise by day and fall by night.11PubMed Central. Daily regulation of body temperature rhythm in the camel (Camelus dromedarius) exposed to experimental desert conditions A camel that warms up instead of sweating to stay cool saves water.
Heat, shortage of water and how much the camel eats all shape how far its temperature swings.12PubMed Central. Daily regulation of body temperature rhythm in the camel (Camelus dromedarius) exposed to experimental desert conditions Camels use these swings even in winter with plenty of water, so it isn’t only about saving water.13PubMed Central. Strategic (adaptive) hypothermia in bull dromedary camels during rut; could it increase reproductive success?
Does the Hump Store Water
The idea that humps hold water probably came from watching camels survive long stretches without drinking.14History. Debunking the Myth: Camels’ Humps and Water Storage But the hump holds fat, not water.
Burning fat does produce water, more by weight than the fat itself.15Today I Found Out. Camels’ Humps Are Not Filled With Water The catch is that burning fat needs oxygen, and in dry air the camel loses a lot of water from its lungs while breathing it in.16Today I Found Out. Camels’ Humps Are Not Filled With Water In hot, dry conditions, burning hump fat may leave the camel with no net water gain, or even a loss.17Conference Paper. Unraveling mystery of bactrian camels and business opportinutis in Gobi So the hump helps a camel survive hunger, not thirst.
A camel’s water endurance comes from the rest of its body. Camels tolerate losing a large share of their body water, far more than people can. They can drink very large amounts quickly when water is found. Their kidneys and gut save water, producing concentrated urine and dry dung.
What Happens to the Hump When Food or Water Runs Out
Camels kept without water for a long time stop eating and run on stored body fat, so their humps shrink as the fat is used up.18PubMed Central. Effects of long-term dehydration on stress markers, blood parameters, and tissue morphology in the dromedary camel (Camelus dromedarius) In fasting Bactrian camels the hump switches off its signals to store sugar and fat.19PubMed Central. Reversible insulin resistance helps Bactrian camels survive fasting When feeding starts again, those signals turn back on and the hump refills.20PubMed Central. Reversible insulin resistance helps Bactrian camels survive fasting
As the camel burns fat, the hump gets smaller and softer, and when little is left it may lean to one side. Once the camel eats well again, the hump refills over weeks rather than overnight.
Well-fed domestic Bactrian humps can stand 40 to 50 cm tall and droop when food is scarce.21Journal of Camel Practice and Research. Research on Distribution, Living Environment and Protection of Wild Bactrian Camel (Camelus bactrianus ferus) Herders judge a camel’s condition partly by hump size and firmness: a floppy hump suggests the animal needs better feeding, and a firm one suggests reserves for a journey. In sick camels, hump fat can be damaged, a problem linked to a lack of vitamin E and selenium.22PubMed Central. Camelidae
How the Hump First Evolved
Camels lived in North America for about 40 million years, many in cold forests.23AccuWeather. Camels evolved from a cold-weather ancestor. We could learn from their remarkable transformation Camel fossils have even been found in the High Arctic, from a warmer period millions of years ago.24PubMed Central. Mid-Pliocene warm-period deposits in the High Arctic yield insight into camel evolution25Discover Wildlife. How did the camel get its hump?
Fat stores help northern hoofed animals survive and breed through cold winters lasting about 6 months, so the hump may first have been a winter food reserve.26PubMed Central. Mid-Pliocene warm-period deposits in the High Arctic yield insight into camel evolution Wide, flat feet that suit sand may first have suited snow.27PubMed Central. Mid-Pliocene warm-period deposits in the High Arctic yield insight into camel evolution The same fat store later helped camels cross big, hot deserts.28AccuWeather. Camels evolved from a cold-weather ancestor. We could learn from their remarkable transformation
Long winters and deserts both leave big gaps between good meals, so a trait that began in one setting could work in the other. The heat-shedding benefit of keeping fat in one spot is probably a later bonus, relevant once heat rather than cold was the main problem.
One Hump or Two and Baby Camels
Dromedaries, the Arabian camel, have one hump; Bactrian camels of Central Asia have two. Bactrians usually have thicker, shaggier coats suited to Central Asian winters, while dromedaries tend to be taller and leaner, a build that fits hot deserts.
Wild Bactrian camels have small, peaked humps about 20 to 25 cm tall that stand straight.29Journal of Camel Practice and Research. Research on Distribution, Living Environment and Protection of Wild Bactrian Camel (Camelus bactrianus ferus) Domestic Bactrians have bigger, dune-shaped humps about 40 to 50 cm tall.30Journal of Camel Practice and Research. Research on Distribution, Living Environment and Protection of Wild Bactrian Camel (Camelus bactrianus ferus)
Baby camels are born without humps.31QCamel. What’s Next for Our Camel Babies? The hump starts to form around two months old, when calves begin eating solid food.32QCamel. What’s Next for Our Camel Babies? A calf lives on milk at first and has little spare energy to store.
How People Use Hump Fat
Desert peoples have long prized camels for meat, milk, hides and hump fat.33Food and Humanity. Exploring the biochemical properties and cosmetic potential of camel hump fat: Influence of biological and physiological factors Saharan and Bedouin cultures use hump fat in cooking, cosmetics and traditional remedies.34Food and Humanity. Exploring the biochemical properties and cosmetic potential of camel hump fat: Influence of biological and physiological factors Those folk uses are a matter of tradition rather than proven treatment.
Because it is mostly saturated, hump fat is fairly solid at room temperature, like other animal fats.35PubMed. Effects of age on fatty acid composition of the hump and abdomen depot fats of the Arabian camel (Camelus dromedarius)36PubMed Central. Lipid analysis of meat from Bactrian camel (Camelus bacterianus), beef, and tails of fat-tailed sheep using UPLC-Q-TOF/MS based lipidomics It remains a regional food in desert communities and is not a common ingredient elsewhere.