Of course, here are four fascinating species that are related to cats:

1. Leopard (Panthera pardus): Leopards are members of the Felidae family, as are domestic cats. They share many physical and behavioral characteristics with cats, including their agile hunting abilities and their preference for a solitary life.

2. Puma (Puma concolor): Also known as the cougar or puma, the puma is another relative of cats. They are agile, have retractable claws and are excellent hunters, characteristics shared with domestic cats.

3. Lynx: Lynx is a genus of felines that includes several species, such as the Eurasian lynx and the Iberian lynx. They are related to cats and share many physical similarities, including pointy ears and thick fur.

4. Cheetah (Acinonyx jubatus): The cheetah is a fascinating species of feline known for its extraordinary speed. Although more distantly related to domestic cats, they still belong to the Felidae family and share some physical characteristics with cats, such as their retractable claws.