The last major work carried out with regards to information regarding the mammals of Thailand was the book Lekagul, Boonsong; McNeely, Jeffrey A. (1977). Mammals of Thailand. This book is an excellent publication but from 1977 until 2017, some 40 years, is a very long time, so I thought it would be a great idea due to the improved research techniques and advances in gathering information, that the time had come to update this excellent work. Many mammals of Thailand occur throughout Asia and reference has been made to where these species occur in other parts of the world.