When learning to count, toddlers first produce the number of sounds associated with quantity.
Theanimalsmarked the end of their responses by pecking an enter key on the screen.
I think all birds are capable of more than humans know, someone wrote
Groundbreaking Study Reveals Crows Can Count—And Out Loud, No Less
Crows are the first known species besides humans capable of producing voluntary sounds to represent an understanding of quantity.
