This thesis conducts a comparative and ecocritical examination of Blackfish and Grizzly Man, two nature documentary films dealing with separate cases of human fatalities caused by wild animals. The aim was to show how nature and non-human animals as well as the relationship between humans/civilization and non-human animals/nature are represented in the films. Additionally, the effects of the representations of non-human animals on a viewer are also examined. For examining representations, the main theoretical frameworks used were: Frans De Waal’s understanding of the concepts of animalcentric and anthropocentric anthropomorphism, and Hillevi Ganetz’s understanding and use of the concept of natursyn (english: view on nature), meaning cultural interpretations of nature, which divides into three views: beautiful, sublime and picturesque. For the additional aim, the concepts of trans-species empathy and false-intimacy were used, the former via Alexa Weik von Mossner’s understanding and use, the latter via Derek Bousé’s. Essentially, the related concepts refer to the human ability to engage emotionally with non-human characters.  What the results show is that both Grizzly Man and Blackfish have ambivalent attitudes toward nature. In both Grizzly Man and Blackfish there are signs of different kinds of anthropomorphism. In terms of natursyn, Grizzly Man consists of a picturesque and a sublime view, articulated verbally and visually, whereas Blackfish consists of a beautiful and a picturesque view, articulated verbally, visually and sonically. The thesis also shows that the representations of orcas as human-like and close-ups of orcas with physical injuries in Blackfish have the potential of creating trans-species empathy. In Grizzly Man, Werner Herzog’s indifferent conception of nature, proclaimed through spoken narration as close-ups of a bear face are shown, discourages the potential effects of such imagery, namely false intimacy.