There are several journals and publications that provide study materials in a visually appealing and easy-to-understand format for the Zoology optional subject. These resources can be highly beneficial for UPSC aspirants who have chosen Zoology as their optional subject. Here are some noteworthy publications:

1. bZoology: Concepts and Connections by Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, and Robert B. Jackson/b:
This publication offers a comprehensive coverage of zoology concepts in an engaging and visually appealing manner. It includes numerous illustrations and diagrams that aid in understanding complex topics. The book also comes with online resources, such as animations and interactive quizzes, which further enhance the learning experience.

2. bAnimal Diversity by Cleveland P. Hickman Jr., Larry S. Roberts, and Allan Larson/b:
This book provides a richly illustrated exploration of animal diversity, presenting information in a reader-friendly format. It covers a wide range of topics, including evolution, classification, and animal behavior. The inclusion of high-quality photographs and detailed illustrations makes it easier for students to grasp the subject matter.

3. bZoology for UPSC Civil Services Main Examination by R. S. Sharma/b:
Specifically tailored for UPSC aspirants, this book offers a concise and well-structured overview of zoology topics. It is designed to meet the needs of the UPSC syllabus and includes visually appealing diagrams and tables that aid in understanding key concepts. The book also incorporates previous years' question papers, providing valuable practice material for the examination.

4. bEduRev Zoology Optional Collection/b:
EduRev is an online platform that offers a vast collection of study materials for various subjects, including Zoology optional for UPSC. The Zoology optional collection on EduRev includes visually appealing notes, diagrams, and videos that simplify complex concepts. The platform also allows users to interact with experts and fellow aspirants, fostering a collaborative learning environment.

In conclusion, there are several journals and publications, such as "Zoology: Concepts and Connections," "Animal Diversity," "Zoology for UPSC Civil Services Main Examination," and the "EduRev Zoology Optional Collection," that provide visually appealing and easy-to-understand study materials for the Zoology optional subject. These resources can greatly assist UPSC aspirants in their preparation for the examination.