Step 1: Understanding the function of loop of Henle.
The loop of Henle helps in concentrating urine by creating a high osmotic gradient in the medulla of the kidney.
Step 2: Relation with habitat.
Animals living in arid environments require maximum water conservation. They possess a longer loop of Henle to produce highly concentrated urine.
Step 3: Conclusion.
Camel, being a desert animal, has a longer loop of Henle.