When they try to move rapidly , they speed up the rate of movement of their limbs or resort to an ungainly hopping gait .
Frogs in the families Bufonidae , Rhinophrynidae , and Microhylidae have short back legs and tend to walk rather than jump .
When families try to move rapidly , families speed up the rate of movement of families ' limbs or resort to an ungainly hopping gait .
Frogs in the families Bufonidae , Rhinophrynidae , and Microhylidae have short back legs and tend to walk rather than jump .