Here are listed articles that explain the actions you can perform on your egg/hatchling/adult dragon.
“Eggs, hatchlings, adult dragons and chickens can all be killed except for the leetle tree.To...Killing
“To force an egg is when one attempts to make an egg hatch earlier by using the kill action on...Forcing
“Reviving is an action that can only be done on dead hatchlings and dead adults. It is when you...Revive
“Abandoning is an action available to unfrozen hatchlings and eggs. This can be used if you no...Abandoning