Most ground locomotion is characterized by quadrupedal knuckle walking. Modern humans are to a large extent characterized by bipedal locomotion and large brains. This is an indication of bipedal locomotion. The robot is strong enough for climbing and dynamic locomotion gaits. Chimpanzees are adapted for both arboreal and terrestrial locomotion. Marmosets have an arboreal locomotion similar to squirrels. Siphonophores use a method of locomotion similar to jet propulsion. Arboreal locomotion is the locomotion of animals in trees. Aquatic mammals also display a variety of locomotion styles. The bell can pulsate to provide propulsion and highly efficient locomotion. This is also the same musculature that is used during locomotion. The vertebrae have projections that allow for strong muscle attachment enabling locomotion without limbs. Recently, the dogma that mammalian platelets lacking nucleus are unable of autonomous locomotion was broken. The cilia are used in locomotion and feeding. It is one of three forms of locomotion adopted by terrestrial mammals.