Naturally the carcass isn't there the next morning.
If it's a major boss then the carcass should be there for an extra day...
Nope, when I first beat the first boss (armored one, forgot the name) I didn't have time to bring it back that day, and it was gone the next. --- Currently playing: Ace Attorney series (DS), Final Fantasy X HD Remaster(PS Vita), Monster Hunter 3 Ultimate (Wii U) 3DS FC: 2208-4521-9535
The boss corpse will disappear if it's being transported through two different areas as the day ends. The corpse needs to be on proper, walkable land. --- Magikoopa Security Force: Defend against the Shy Guys! Check out the demo (offsite): http://www.mfgg.net/index.php?act=resdb¶m=02&c=2&id=29243