The Caspian is a subspecies of which animal?

Which group of vertebrates has the highest number of endangered species?

The species,which is going to become extinct due to lack of proper care,would be called:

Which of the following is known as the 'Terror of Bengal'?

Which of the following is an aquatic weed?

Poaching of tiger is a burning issue in today's world. What implication would this activity have on the functioning of the ecosystem of which the tigers are an integral part?