Mudraptor Egg
From Official Barotrauma Wiki
The Mudraptor Egg is a rare drop from Mudraptors.
It can be sold for money or grown with saline and hatched into a (hostile) Mudraptor.
Growth
The Mudraptor egg can be grown by feeding it saline.
After feeding it a first saline It will drop from inventory you won't be able to pick up it again.
After "consuming" few more saline it will hatch into a mudraptor.
Even though you hatched it, it will still be hostile.