A woman is equal to 500 ducks. Who said that?

There is no clear source for the saying that a woman is equal to 500 ducks. It is usually used to describe a woman's ability to have multiple children or a person's ability to handle multiple tasks at the same time. It can also be used to describe a person's verbosity.

The real meaning of this sentence is that a person can cope with different situations and needs, just like a duck, he can survive and adapt in different environments and conditions. This sentence can also be understood as a compliment to a person's multitasking ability and adaptability.