Communication about biodiversity loss is insufficient and audiovisual stories can help to effectively communicate the problem. This research developed the optimum communication criteria for communicating effectively about biodiversity loss through audiovisual stories. We created our theoretical framework by combining contemporary research about audiovisual stories concerning science and studies on effective communication about biodiversity loss and conservation. Based on this framework and using relevant multimodal critical discourse analysis tools, we built an analytical model. We applied the model to the analysis of three contemporary audiovisual stories concerning biodiversity loss: Rang-tan: the story of dirty palm oil (Greenpeace International, 2018), “Dream” (Wildlife Conservation Film Festival, 2016, original quotation marks), and The Birdman (Fordesman, 2020). The research findings demonstrate that current audiovisual stories lack aspects of the optimum communication criteria and that conservation communicators have not yet made use of the medium's full potential. Ideally, this thesis has the potential to encourage further research on how to communicate more effectively about biodiversity loss.