Many zerg ground units may burrow, become invisible and may be revealed primarily by detectors, and may not move or attack. Exceptions are the roach, who may move while burrowed, the infestor, who may move and cast Infested Terran, and the baneling which can detonate while burrowed.
Some units can unburrow via autocast, causing them to emerge and attack when an enemy moves into range.
Queens can target a hatchery/lair/hive with Queen Ichor, causing it to swell and grow green sacs which burst, producing 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 does not 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The following section contains information from a previous version of StarCraft II which is no longer valid.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.
↑"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.
↑Blizzard Entertainment Staff. 2010-07-24. Infestor. Blizzard Entertainment. Accessed 2010-07-24.