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Aprox. Size	2.35 metres (7.7 ft)^[1]

Promethean Crawler
General Information
Purpose	Combat and Defense
Strength	Low
First Seen	July, 2557
Weaponry
Primary	Varies by type Boltshot (Standard Crawlers) Suppressor (Alpha Crawlers) Binary Rifle (Crawler Snipes)
Weaponry Strength	Varies by type
[Source]

Crawlers are advanced Forerunner AIs and a new class of enemies in Halo 4.^[2] They are quadrupedal in design, and are capable of both close-quarters and long-range combat, having been engineered to ferociously hunt down and eliminate any foreign threats. It is not uncommon to encounter Crawlers in substantial numbers, as most travel in large packs and work together in strategic coordination to bring down enemies by overwhelming them from every conceivable angle.^[3]

CrawlerEdit

The standard Crawler is the most common variant of the Crawler. It is able to cling to surfaces and melee the player. They are equipped with a Boltshot.

Crawler SnipeEdit

Crawler Snipes are similar to regular Crawlers, except with an additional 'horn'-like segment and face-protection added. They are the Promethean forces' scouts and snipers, lurking and picking off their enemies from afar. They utilize the Binary Rifle and can track foes through obstacles with Promethean Vision.

Crawler PrimeEdit

Crawler Primes (or Alpha Crawlers) are the leaders of packs of Crawlers. They are easily distinguishable from other Crawlers because of their spines. They utilize the Suppressor.

TacticsEdit

Despite the fact that Crawlers are the cannon fodder of the Prometheans in a manner similar to Unggoy, the Crawlers with their advanced agility and harassment tactics they actually fight in a role more similar to the Covenant's Skirmishers.
With aggressive tactics, access to powerful weapons, superior marksmanship, and the ability to melee the player; Crawlers represent a much more dangerous enemy akin to the typical Unggoy. Grenade throwing and kamikaze attacks are the only abilities a Unggoy has but a Crawler lacks access to.
Although they can be taken down with a single headshot, Crawlers are actually resilient enough to shrug off several hits to the body and fight on.
Despite their small size they are very strong at melee attacks and you should try to avoid close comabat with them as much as possible.
Crawlers tend to attack in groups to try to overwhelm a player.

TriviaEdit

Crawlers are the most extensive and abundant native enemy on Requiem.
During the demo at E3, you can see a pack of Crawlers attacking the Master Chief before he continued on. In the end of the trailer, a creature that is possibly a different rank of the Crawler, or another species entirely can be seen for a few frames.
Despite the Boltshot having a charged shot, Crawlers are never seen using this powerful function.
Cortana states that Crawlers have similar 'cortical footprints' as the Knights.
While Knights seem to be made from humanoids, Crawlers are more animal-like in their movements.