This study aims to analyze the requirement Animal Development textbooks based on the REACT model, namely Relating, Experiencing, Applying, Cooperating, Transferring. The method of analyzing needs has been done by Thiagarajan's 4D development model to the defining stage. The research subjects were students of Biology Education IKIP Budi Utomo Malang who had taken animal development courses as many as 40 people. Data collection techniques carried out by observing, conducting questionnaires to students and lecturers the result of the study based on questionaire showed that the lack of relevant learning resources. 75 percent students still had difficulty attending lectures, Moreover 100 percent students agreed to use a textbook based on the development of Animal-Based REACT models. The results of the analysis of the need for lecturers supporting animal development courses states that it is very necessary to develop textbooks based on the REACT model especially cell division material because this model can empower students' thinking abilities and can practice independent learning in understanding animal development material.