Oh, the article is by Katherine Rundell. She has written some very nice children's books.

See also https://news.ycombinator.com/item?id=46511555

The Greenland shark appears, if I remember correctly, in her book "Golden Mole", which is about many interesting creatures. This is published as Vanishing Treasures in some countries. Her "Super-Infinite: The Transformations of John Donne" is interesting and also not a children's book.