Threatened animals are :
(i) Blue Whale : It is hunted for oil and the blubber, which are used for making medicines, so it is endangered.
(ii) African Elephant : They are endangered because they are hunted for their ivory.
(iii) Sea Turtle : The turtles are used to make many things. Its shell is used to make jewellery, combs and sun glasses. Thus their killing is making them endangered.
(iv) Bengal Tiger : Tiger is killed for its skin and bones.
(v) Black Rhino : It is mainly killed for its horn, which are used for making handle of draggers. The main cause of threat is the destruction of their habitats.