R.L. Kotpal is widely considered the "gold standard" for undergraduate and postgraduate zoology students in India and neighboring regions. His Modern Text Book of Zoology

R.L. Kotpal has democratized access to quality zoology education. For lakhs (hundreds of thousands) of students in remote Indian towns and cities who cannot afford costly imported textbooks, Kotpal’s books are the bridge to understanding the animal kingdom. Many medical and civil services aspirants still keep his books as a foundation reference.

When students of life sciences in India flip open a dog-eared, highlight-streaked copy of a zoology textbook, one name appears with remarkable consistency: . Over the past several decades, Kotpal has become synonymous with undergraduate and postgraduate zoology education across the country.

R.L. Kotpal is a highly respected Indian academic and author, best known for his comprehensive, student-friendly textbooks on zoology. While detailed biographical information is sparse (as is common with many Indian textbook authors from his era), his legacy is carried entirely by his books. He is often associated with (Meerut University, Uttar Pradesh) and has co-authored and edited numerous standard texts alongside other notable figures like Dr. P.S. Dhami and Dr. S.S. Lal .

It is a top recommendation for competitive exams like UPSC Mains (Zoology Optional) and various PG entrance exams because it aligns closely with standard Indian university syllabi. Modern Textbook of Zoology: Invertebrates - Amazon.sg