A highly poisonous animal X which inhabits crop fields is commonly known as the friend of the farmer. It eats up pests like Y and saves the crops from damage. The animal X is killed in large numbers to obtain its Z which sells in the market at a high price. What are X, Y and Z?
X: Snakes-Snakes kill animals like rats that damage food crops. As they prevent the destruction of food crops that a farmer grows for his livelihood and hence snakes are farmer's friends.
Y: Rats -Rats have been estimated to damage more than 1% of the world's cereal crops and, in developing countries.It is eaten by Snakes.
Z: snake Skin- Used for making bags and boots.