Abstract
A variety of animal behavior under microgravity has been found in the experiments using parabolic aircraft flights and in space. Forward looping in fish and tadpoles is contrast to backward looping of pigeons, while frogs and hamsters extend their extremities with the head turning backward. Postures of monkeys and man, on the other hand, are different from those of above animals. Loss of vestibular input must be common to all of these animals and there may be some similarities among the species in the sensory conflict against it. Advancing animals experiments in space, it is important to make further progress in comparative neurology particularly regarding the posture control and behavior of animals.
