Queens can target a hatchery/lair/hive, causing it to eventually spawn four larvae. These join any already-present larvae. The larva-producing structure will not naturally produce any more larvae until the total falls below three. The larva count for any given hatchery/lair/hive cannot exceed nineteen, no matter how many times spawn larva is cast.
The following section contains information from a previous version of StarCraft II which is no longer valid.
The queen breathes out a giant cloud of dusts and insects which can be controlled. They deal damage to enemy units, including air units, and extra damage to biological units, without injuring friendly units. The swarm eventually exhausts itself.
↑Underwood, Peter, Bill Roper, Chris Metzen and Jeffrey Vaughn. StarCraft (Manual). Irvine, Calif.: Blizzard Entertainment, 1998.
↑"for zerg is it the same that the hatchery sets the rally, or can you rally for each individual egg?"
You can do both. You can set a rally for your hatchery, but can then override it with manual orders per egg as well. Also don't forget, you can set a worker rally point for your hatchery, as well as a unit rally point. Karune, Rancid_death75. Another rally question for Kaurne!Battle.net StarCraft II General Discussion Forum. Accessed 2009-02-18.