Camel

A large hump-backed desert mammal capable of going days without water — central to desert civilizations from Arabia to the Sahara, with two hump-counts (one and two) representing distinct species.

Two species, defined by humps

The “camel” is two distinct species:

Dromedary (Arabian camel) — Camelus dromedarius. One hump. Lighter build, taller, faster. Found in Arabia, the Middle East, North Africa, and as introduced populations in Australia.
Bactrian camel — Camelus bactrianus. Two humps. Stockier, hardier in extreme cold. Found in Central Asia (Mongolia, China).

A wild Bactrian subspecies (Camelus ferus) survives in the Gobi Desert — fewer than 1,000 remain, Critically Endangered, distinct genetically from domesticated Bactrians.

What’s in the hump

Common myth: camel humps store water. Reality: humps store fat, not water. The fat reserves can sustain the camel for weeks without food, and metabolic breakdown of fat does produce some water as a byproduct, but the hump itself is fatty tissue.

Water storage adaptations are different:

Concentrated urine — kidneys produce extremely concentrated urine to retain water.
Dry feces — almost no water lost in waste.
Body temperature swing — camels tolerate body-temperature variation from 34°C at night to 41°C during the day, reducing the need for sweat-cooling.
Oval red blood cells — uniquely shaped to flow even when dehydrated.
Rapid rehydration — a thirsty camel can drink 100 liters in 10 minutes without harm; most mammals would die from osmotic shock.

Desert civilizations

Camels enabled long-distance desert trade across the Sahara and Arabia. The Trans-Saharan trade in salt, gold, and slaves depended on camel caravans. The Silk Road between China and the Mediterranean used Bactrian camels in Central Asia.

The Bedouin civilization of the Arabian Peninsula was inseparable from dromedary camels — for transport, milk, meat, wool, and as wealth measurement.

Australia’s feral camels

The largest feral camel population in the world is in Australia — estimated 1+ million dromedaries roaming the outback, descended from camels brought in the 1800s for desert exploration and railway construction. Released after motor vehicles displaced them, they’ve thrived in the Australian deserts. Australia now exports camels back to Saudi Arabia.

Spitting

Camel spitting is real but exaggerated. They mostly regurgitate stomach contents (a kind of vomit) at threats — including humans they don’t like. The technique is reserved; they don’t spit casually. But once you’ve been spit at by a camel, the smell is unforgettable.