Light can vary in intensiy, color, or polarisation, the last of which refers to the orientation of light waves as they travel through space. Humans are largely insensitive to polarised light, but many animals make use of it for a variety of tasks. Fiddler crabs are highly sensitive to polarised light. However, the underlying intricacies of how this visual system operates is still poorly understood. The fiddler crab Uca tangeri is an ideal model organism for studying polarisation vision. It’s large eyes are positioned high above the body on stalks, and are used for detecting predators and conspecifics in a highly polarised environment. This short research trip is an information-gathering visit to assess the suitability of Donana National Park as a fieldwork site for future work.