166 



THE STUDY OF ANIMAL LIFE CHAP. 



exploration of a corner in search of food. It shows 

 control and selection. It may profit by experience, as 

 may be seen in the way an inverted starfish is able to 

 right itself more and more quickly day after day up to 

 a certain limit when it has done its best. 



As the type-case of what we propose to call simply 



FIG. 50. YOUNG DUCKS CATCHING MOTHS. 

 (From St. John's Wild Sports.) 



organismal behaviour (or scnsori-motor behaviour) we 

 take the attack which the brainless, ganglionless starfish 

 makes on the brainless, ganglionless sea-urchin. The 

 starfish lays an arm upon the spinose surface of the sea- 

 urchin and grips with its suctorial tube-feet. The sea- 

 urchin responds by biting with its numerous snapping 



