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The aim of this study was to develop an introducing book of insect pollinators in mangrove forest on the east coast of North Sumatera based on research results. This book was aimed to be used in Animal Ecology course for undergraduates students of Biology Education in State University of Medan. The book was developed according to Thiagarajan model consisted of 4 stages: Define, Design, Develop and Disseminate or better known as the 4-D model. However at this stage only up to development stage is reported. The introducing book draft was validated by one lecturer teaching Animal Ecology to check for the book quality content, one lecturer validated its instructional media and one lecturer validated for its suitabilty to be used as learning source. The validation results showed that the book content was scored 87.30%, which was considered very good,as a media the book was scored 86.33%,which means very good and as a learning source the book was scored 85.30%,which means very good, The introducing book draft was also read and scored by students and the result was 80.38% and was categorized as very good. The results from those validations will be used as a basis for revising the introducing book.