head nodding
eyelid movement
rhythmic movement
A: Did you notice the rhythmic nictation of that bird?
A：你注意到那只鸟有节奏的点头动作了吗？
B: Yes, its nictation seems to follow a specific pattern.
B：是的，它的点头似乎遵循某种特定的模式。
1) 点头或眨眼的动作
2) 动物规律性的头部运动
1. 点头或眨眼
noun
1. The act of nodding or blinking, especially a rhythmic movement of the head or eyelids in animals.