|“||Those things can eat through metal!||”|
— Matt upon seeing the creature's tunnels.
Crawlies are creatures featured in Season 2's episode Molon Labe. They are apparently in the employ of the Overlords. They are deployed when the Overlords need to infiltrate a position to take it by surprise instead of their more typical frontal assaults.
The origins of the Crawlies is unknown. They may be another species enslaved by the Overlords with harness's or willing allies. They may not even be sentient at all, just animals domesticated and trained by the Overlords to track down prey like human hunting dogs.
They are first encountered in the basement of the hospital after the 2nd Mass captures an Overlord; apparently sent by the aliens as a means to force the humans to surrender their captive. They kill Jamil by infesting him like a Trojan horse and trap Lourdes, Matt, and Anne in the basement. Matt manages to escape and gets help by crawling through the vents; running into Tom and Pope and some of the others who get him to safety and rescue the girls.
The humans manage to trap the creatures in the basement but because they can eat through metal this is a temporary measure. It is unknown what happened to them after the Second Mass left.
They are mentioned again in the season 2 finale, but do not physicaly show up.
No Crawlies have ever been seen utilising any form of technology.
Crawlies have vaguely arachnid-like features (albeit with six insect-like limbs instead of eight). They are about the size of a human hand and are a dull grey in colour with blue strips along their torso. They have two small eyes and a flat head with a broad mouth structure similar to that of a skitter. These jaws are strong enough to eat through metal.
Crawlies appear to be natural burrowers: small enough to slip into enemy structures unnoticed through vents and air ducts, and with time they can bore their way through barriers they may encounter such as doors.
While durable against melee-weapons, they can be killed by gunfire without too much trouble. However, they appear to be pack hunters, deploying in large numbers and using swarm tactics to overwhelm opposition similar to Army Ants.
When attacking they can rear up on their four hindlegs and use their pair of forelegs like a Preying Mantis. They can also hide in a body and burst out in a manner of a trojan horse (weither or not this is a mode of reproduction is unknown).
Not much else is known about Crawlies biology. It's unknown if they have an exoskeleton - like terrestrial insects and arachnids - or an internal bony endoskeleton. However they appear very durable, irrespective of how their bodies supports are structured, as they can withstand several hits by the butt of a rifle before death (According to Hal it took fifteen hits to kill one). Their muscles and circulatory system are also unknown.
Nothing is known about Crawlies society and beliefs, assuming they even have any, other than the fact that they appear to be a collective species like Ants or Termites.
No Crawlies have ever demonstrated individuality. This may be due to having a hive mind mentality (they appear to swarm and move in unison) or they may not be intelligent at all.
Behind the ScenesEdit
This species has never actualy been named onscreen. The name comes from Will Wheaton via the Falling Skies online media (Second Watch aftershow) on TNT.com.