Marine wildlife tourism targets many different species that inhabit the coastal and marine environment. From mega fauna like whale sharks (Rhincodon typus; e.g. in Honduras), leatherback turtles (Dermochelys coriacea; e.g. in Trinidad) or beluga whales (Delphinapterus leucas; e.g. in Canada) to rather small wildlife such as Atlantic puffins (Fratercula arctica; e.g. in Iceland) and golden jellyfish (Mastigias species; e.g. in Palau), our planet has a lot to offer. However, many species are at the brink of extinction, and in some cases, like the vaquita (Phocoena sinus, a rare species of porpoise), only a few individuals remain. Hence, best-practice wildlife tourism operations should always contribute to the conservation of the species observed.