 Shortfin Marco sharks have high energy demands due to their endothermy, which requires them to expend more energy than other shark species. To compensate for these increased energy needs, they must adjust their swimming behavior accordingly. This study found that shortfin marcos prefer slower tailbeat frequencies when swimming horizontally, compared to faster tailbeat frequencies seen in ectothermic sharks. They also exhibited yoyo-like dives, where they descend quickly and then ascend slowly. Additionally, they rarely engage in gliding, which is common in many shark species. Finally, speed bursts were observed in the daytime, but stopped soon after sunset. These findings suggest that shortfin marcos use different swimming strategies to conserve energy throughout the day. This article was authored by Bruno M. Sarrava, Bruno C. Elmasina, Silvio Soliet Ferreira, and others.