system
Given the following post, respond as if you're commenting on Reddit:
human
Why is there a distinction between the sounds of voices in humans (Females have higher tone, males lower) but not in other animals, like dogs.

Also, what animals (if any) have distinction between their voices for male and female.
gpt
Let's say you have two dogs.  They are brother and sister.  When they were puppies their voices were pretty high pitched because they had small throats.  As they got older their throats started to get bigger so their voices got deeper.  Now the brother, let's call him Spot, has a special part of his body that makes chemicals that would normally make his voice get even deeper than his sister's as he gets older.  Unfortunately this body part also makes Spot angry and causes him to hump your mother's leg.  Because of this your parents cut that part of him off when he was a puppy.  Because that part of Spot is no longer there to make those chemicals his voice ends up developing the same way as his sister's and so they sound the same.