Scientists once thought that the jaguar species-like all other big cat can species was divided into smaller groups called subspecies. These form when groups of one type of animal become isolated from each other. The members within each group breed cause with one another Over time, the groups develop slightly different genetics (codes passed from parents to offspring that determine traits). In 2001 experts examined the DNA (or sets of genetics) in the fur and droppings of jaguars from Mexico to Om Argentina. Results revealed that no subspecies exist-all jaguars belong to one genetic group. "Every other big cat has subspecies," says wildlife ecologist Alan Rabinowitz. "This really makes the jaguar unique. Scientists believe that jaguars move around so much that they do not have a chance to form isolated groups that can turn into subspecies." That's good, "Rabinowitz says. "Isolated animal are more vulnerable to the extinction. Meaning that a jaguar's travel habits might actually take the could species far in life