Imitating or implementing?

This morning while walking home from the store I passed a neighbor who was taking out the trash. She called out

and I responded in exactly the same notes

and then I heard a THIRD voice singing the same notes in the same rhythm. It was a bird, who had undoubtedly been singing those notes repeatedly.

Were the humans unconsciously imitating the bird, or were all three creatures implementing the same genetic command?

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