He has also written an article on the subject to Politics Home:
The facts are stark. Tiger numbers have fallen from 100,000 a hundred years ago, to a situation where there are now more in zoos than in the wild. Central Africa has lost 64% of its elephants in just ten years. 50,000 were slaughtered in 2013 alone. In the oceans, 73 million sharks are killed every year for their fins. Clearly this is all hopelessly unsustainable.Norman had a Commons adjournment debate on the subject, You can read the transcript on They Work for You.
Oh, and ignore the cruel suggestion by the Spectator that the Liberal Democrats are themselves an endangered species.