The term 'hybrid big cat' refers to a cross-breeding of two different species of big cats, such as a lion and a tiger. The most well-known example of this is the liger, which is a hybrid of a lion and a tiger. Ligers are the largest of all big cats, and they have a unique combination of physical traits from both of their parent species. They are typically larger than either of their parents, and they have a distinctive striped pattern on their fur.