Can you inherit from the vanilla mobs instead of reimplementing them?

[nearlyNonexistent]

See title. If you could, say, inherit ClassChicken or whatever it's called in the Minecraft Forge code, you would be, presumably, compatible with any mod that changes vanilla mobs (e.g. Druidry makes it possible to milk cows with a bowl) naturally and have to write less redundant code. You could then focus on writing the differences FROM vanilla mobs, rather than reimplementing them.

[knoxhack]

Being implemented in the next update

[knoxhack]

Implemented :), let me know of any feedback