This animation pictures a school of fish led by a larger fish that roams through the water in a zigzagging pattern. When it encounters a cylindrical obstacle, the school splits into two groups: one group consisting of a few fish passes by one side of the obstacle, while the other group comprising the remaining majority passes by the other side following the lead fish. As soon as the fish in the smaller group have cleared the obstacle they speed up to rejoin the school (see Fig. ).
|Xiaoyuan Tu||January 1996|