No one, they just kind of fall off.
Yup, they just kind of fall off for various reasons.
If their horns get too heavy, if they trip... lots of reasons.
Like salamanders, yes.
Who's implying what?
The nascent heads, which are kind of like polyps, are already there when the old head falls off... They just open up their eyes... There are a few seconds there though when things get pretty dicey.
We collect them and sell them to collectors... They rot very quickly though, so we have to sell them quickly.
Because unicorn heads are the new leprechaun thumbs.