1.Intended for first- and second-year CBCS BSC Hons in Zoology students. 2. Using the new syllabus mandated by the UGC and other West Bengali universities in accordance with CBCS (Choice Based Credit System). 3. Non-chordates, microbiology, ecology, cell and molecular biology, viva voce, and bibliography are among the segments that are included. 4. Chapters that are specifically structured to benefit students and include all necessary text and pertinent, vivid illustrations.