The book "Bird Calendar of Northern India" by the author Douglas Dewar reveals to the reader a unique world of shades, sounds and forms of life of birds living in northern India. According to the title of the book, the author offers readers a bird calendar, divided by month, where you can learn about various types of birds, their habits and behavior in the natural environment. Detailed descriptions of the author's observations allow you to get to know the life of birds better, and also help to understand the importance of their presence in the ecosystem of northern India. Douglas Dewar's book is an important source of information for naturalists and birders, as well as anyone interested in the fauna of northern India.