Jaguar

Jaguars in rainforests(especially in the Amazon) are covered in dark sports with big claws, and large tails so that they can climb trees to hunt for their prey. But due to climate change making the Amazon slowly turn into a savanna, the jaguar would not need to have big claws or spots on its body as it would need to be more adapted to run. Additionally, they would have to be more skinny and need to have a shorter, skinnier tail to be more aerodynamic as well as a a more brownish color to better hide in the savanna.