Sharks are marine predators that constitute a potential threat to humans and their specific behaviours often play a critical role in triggering fatal attacks (Clua & Séret 2010; Clua & Reid 2013; Clua et al. 2014). Several authors have recently outlined the economic importance of shark-based ecotourism which far outweighs the single-use income obtained from fishing (Clua et al. 2011; Gallagher & Hammerschlag 2011; Vianna et al. 2012). However, the development of such activities increases the potential interactions between sharks and humans and the correlated risk of accidental bites (Brena et al. 2015), in particular when unsuitable provisioning practices such as hand-feeding are implemented (Clua & Torrente 2015). In such a context, a better understanding of shark agonistic behaviours is indispensable.

In a valuable response to this challenge, Aidan Martin published a paper entitled ‘A review of shark agonistic displays: comparison of display features and implications for shark-human interactions’ (Martin 2007). This paper focuses on the behaviour of 23 shark species and includes supplementary online material (SOM) composed of several videos displaying specific shark behaviours (see Figure 1). These are available at: http://www.tandfonline.com/ doi/suppl/10.1080/10236240601154872. The nine files that can be downloaded include the following common text ‘gmfw_a_215414_sup_’ with an additional number ranging from 001 to 009; a short description of the video clip is also provided. One would expect these files that are ranked by increasing numbers to correspond to the video clips in their citation order in the text (as video clip 1, 2, etc.). There are, however, some discrepancies between the text and the SOM as well as some missing material.