Question

How can forest officers recognised the presence of certain animals in forest

Answer 1

 forest officers recognised the presence of certain animals in forest by their foot prints and droppings as animals differ in foot prints and droppings
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Answer 2

Forest officers are an integral part of a forest area.

They should protect the forest area and boundaries.

They have to inspect the area in which he/she is working.And they have to maintain a good communication with the people.

Now,these forest officers are well trained before joining this Service.So they can easily recognise several animals by their footprints.