Why does a camel have a hump?

Question

Answer 1

Camels do not store water in their humps, as it is commonly believed. The humps are actually reservoirs of fatty tissue. Concentrating body fat in their humps minimizes heat-trapping insulation throughout the rest of their body, which may be an adaptation to living in hot climates. When this tissue is metabolized, it acts as a source of energy and yields more than 1g of water for each 1g of fat converted through reaction with oxygen from air.

Answer 2

Instead, these odd protrusions are mounds of fat — allowing the gangly beast to travel days through the desert without stopping for a bite to eat. A camel can carry up to 80 pounds of fat on its back (Baby camels don't get their humps until they start eating solid food).