Right-clicking mobs will give you a bucket with that mob. Crouch to restore normal behavior.
NBT is saved when an entity is picked up and restored when placed. With commands, entity NBT can be placed into the EntityData tag.
In Creative Mode, picking up mobs will delete them and placing works the same as with spawn eggs.
Links
Featured versions
See allProject members
vladaviedov
Owner
Technical information
License
MIT
Client side
required
Server side
required
Project ID