In species in the order Carnivora, some of which are insectivores rather than carnivores, the cats are some of the most highly evolved predators designed for speed, power, and acceleration rather than stamina. Compared to ungulates, their limbs are shorter, more muscular in the distal segments, and maintain five metacarpals and digit bones; providing a greater range of movements, a more varied function and agility (e.g. climbing, swatting, and grooming). Some insectivorous species in this order have paws specialised for specific functions. The sloth bear uses their digits and large claws to tear logs open rather than kill prey. Other insectivorous species, such as the giant and red pandas, have developed large sesamoid bones in their paws that serve as an extra "thumb" while others, such as the meerkat, uses their limbs primary for digging and have vestigial first digits.