Sounds like one hen lays two eggs in three days... but that's just not what happens in the chicken coop... [edit] wtf I tried to type 1 every 4-5 days, but it came out 4-5 in one day.

But I'm gonna say, WTF, what kinda animal is a HALF? and obviously it say's it only lays a HALF, so maybe it has live birth, like some snakes and sharks..... If that is the case, how many of the one half's, "one half's" siblings were consumed, while it was developing in the womb :P