For what i have seen, It does not look like the Overlord/Overseer has the ability to carry/drop units! Is there a different unit to carry/drop units, or to you have to tech for the Overlord/Overseer to have the ability, or has it just been taken out for the Zerg?

Thanks!

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Q u o t e:
http://www.sc2armory.com/game/zerg/units/overlord

You can upgrade ventral sacs when you have a Lair.

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Yes, confirmed!