Once Japan wanted to import frogs from Nepal to do some tests in the biological labs there! The frogs were packed in sacks alive and loaded in trucks. When the trucks reached the port,the sacks containing the frogs were transferred to boats there. Finally the boats were unloaded in the coast of Japan ! Surprisingly, the sacks were found open while they were unloaded from the boats. The frogs in the sacks were counted and the number was intact !!! A commission was made to investigate why the frogs hadn't jumped into the sea even if the mouths of the sacks were open. The investigation found that the Nepalese frogs were really smart. The outer frogs in the sacks saw the water in the sea and they made effort to jump into the sea but the frogs at the back were much more smart and they pulled the legs of the front ones and so on. So none of the frogs could jump out of the sacks!