He has explained this radical change in the subject of his writings as follows :
Since the early 1990s , Masson has written a number of books on the emotional life of animals , one of which , When Elephants Weep , has been translated into 20 languages .
Masson has explained this radical change in the subject of Masson 's writings as follows :
Since the early 1990s , Masson has written a number of books on the emotional life of animals , one of which , When Elephants Weep , has been translated into 20 languages .