“…Infrared thermography (IRT) allows temperature across the entire body surface to be determined from an image, which makes it an extremely useful tool for studying the thermal physiology of animals on land (Speakman and Ward, 1998;McCafferty, 2007;McCafferty et al, 2011;Tattersall, 2016). Furthermore, IRT can be applied at the population level (e.g., aerial surveys, long-term monitoring and conservation efforts; Pabst et al, 2002;Udevitz et al, 2008;Horton et al, 2017) to study the thermal ecology and habitat range of a species, which is crucial particularly in light of recent studies that highlight the differential vulnerability of marine species to climate change (Hamann et al, 2013;Albouy et al, 2020). Unfortunately, water absorbs infrared radiation precluding its use underwater, but IRT has been used to study thermoregulation of amphibious marine vertebrates while on land (Figure 11; Nienaber et al, 2010;McCafferty et al, 2013;Mellish et al, 2015;Chaise et al, 2019), as well as some divers while at the surface (Cuyler et al, 1992;Perryman et al, 1999;Pabst et al, 2002;Barbieri et al, 2010).…”