Five of the best books about elephants

One title on the Barnes & Noble Review's list of five top books about elephants:
The Elephant's Secret Sense
by Caitlin O'Connell

In her compelling account of scientific discovery Caitlin O'Connell chronicles her dawning realization that a herd of elephants she was observing used their feet to "listen" to the seismic communication of other herds, allowing them to converge accross great distances