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?

Snakes are killed in large numbers because:
(a) they are very poisonous
(b) they kill rats
(c) their skin is expensive
(d) they damage the crops

X is a wild animal which eats only the flesh of other animals whereas Y is a domestic animal which feeds mainly on green grass.
(a) What are animals like X known as ?
(b) What are animals like Y known as ?
(c) Which animal, X or Y, has a longer small intestine ? Why ?
(d) Name one animal which is like X.
(e) Name one animal which is like Y.