A biodiversity learning support system was developed based on immersive virtual reality (IVR). The aim of this system was to deepen users’ understanding of and interest in the importance of preserving biodiversity by allowing them to visualize endangered and extinct species in a realistic VR space. Mammals, birds, reptiles, and amphibians were selected from the Ministry of the Environment of Japan’s Red List of endangered and extinct species. These animals were modeled in three-dimensional (3D) form and placed in the virtual space. Users wear a head-mounted display and move freely within the VR space from a first-person perspective while viewing detailed information alongside the 3D animal models. Quizzes are provided to enhance the learning experience. These features aim to give users with a visual and physical experience that cannot be conveyed through conventional passive learning methods and to increase their general interest on biodiversity preservation. An evaluation survey involving 31 participants assessed the operability, functionality, satisfaction level with the visual experience, and changes in user interest. The survey results suggested that users were highly satisfied with both the operability and the realism of the visual experience. An increase in users’ interest in biodiversity preservation was also confirmed.