Mr. N. Sivasothi a.k.a. Otterman, is an educator who loves animals, nature and the environment. As well as being Director of Studies at Ridge View Residential College, Research Associate at the Lee Kong Chian Natural History Museum and Senior Lecturer in the Department of Biological Sciences, Siva is also a member of 14 working groups in Singapore around the theme of biodiversity and an active member of stakeholder engagements with developers.

He is well known for his environmental work and being an expert on otters and other wildlife in Singapore as well as prolific in his lively talks and insightful blogs on the subject.