Camel
This animal has been domesticated by man for more than 3 millennium now. They are story huge animals with a fatty hump back which can carry load weighing up to 90 Kg and can work for 20 miles in desert area without drinking water and eating food.
Lessons learned from it
Camels are perfect example of endurance. Imagine it walking up to 20 miles, carrying up to 90kg of load without timing.
Some life's problem are as heavy as that e.g chronic illness which linger for very long with endurance like that of a camel we can bear these problems till the day it will be no more