India, Feb. 23 -- The fourth edition of Indian Mammals: A Field Guide (2023) marks 20 years since the first, and represents a quantum leap.

"Camera traps have changed the game and helped us understand species much better. This is particularly true of the small, nocturnal animals such as otters, small cats, civets and badgers," says its author Vivek Menon (right), 55, a conservationist and co-founder of the NGO Wildlife Trust of India.

Updated data on matters ranging from classification to size, behaviour and characteristics is now represented in the book. Also represented are changes in prevalence, which can be gauged through impactful maps showing current and historic distribution for each species.

More than 1,000 photographs, sourced f...