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    Mr. White looks out of his window. There is a boy at the there side of the street. The boy takes some bread out of a bag and begins eating it. There is a very thin dog in the street, too. The boy says to it, “Come here, good dog. I'll give you some bread.” The dog is hungry and goes to the boy, but he does not give it any bread. He kicks the dog. It runs away.  Then Mr. White comes out of his house and says to the boy, “I'll give you a shilling （先令，英国货币）.”  The boy is happy and says, “yes”. “Come here,” Mr. White says. The boy goes to him, but Mr. White doesn't give him a shilling. He hits him with a stick.  The boy cries and says, “Why do you hit me? I don't ask you for any money.” “No,” Mr. White says, “And the dog doesn't ask you for any bread, but you kick it.”

如图所示，直线MN上方存在着垂直纸面向里、磁感应强度为B的匀强磁场，质量为m、电荷量为﹣q（q＞0）的粒子1在纸面内以速度v₁=v₀从O点射入磁场，其方向与MN的夹角α=30°；质量为m、电荷量为+q的粒子2在纸面内以速度v₂= $\sqrt{3}$ v₀也从O点射入磁场，其方向与MN的夹角β=60°角．已知粒子1、2同时到达磁场边界的A、B两点（图中未画出），不计粒子的重力及粒子间的相互作用．

下列现象中，不属于动物行为的是（    ）