In nature, a single selection pressure can act on multiple traits of an individual animal, and a single trait of an animal can also be under multiple selection pressures. Given the potential for complex trade-offs acting across multiple traits, it would be more ecologically relevant and meaningful to study multiple traits of an animal in the wild, where they are simultaneously under multiple selection pressures. However, such processes have rarely been examined in animals, especially in their natural habitat. In my thesis, I will examine how risky behavioural traits are expressed under multiple selection pressures and how variation in the expression of multiple risky behavioural traits contributes to an animal’s fitness. I will also examine the correlations between different risky behaviours and test hypotheses for such correlations. I will conduct behavioural experiments on Psammophilus dorsalis in their natural habitat to answer these questions. In my 1st chapter, I will examine how natural and sexual selection factors simultaneously affect decision-making in response to threat in adult male P. dorsalis. In my 2nd chapter, I will examine correlations between multiple risky behavioural traits and their relative effects on fitness in adult male P. dorsalis. In my 3rd chapter, I will examine if the expression of risky behavioural traits is heritable in adult male P. dorsalis.