Blood Crawler

Type	Enemy
Environment	The Crimson
AI Type	Fighter AI (ground); Spider AI (on wall)
Damage	30/60›54/90›81
Max Life	60/120›132/180›198
Defense	8
KB Resist	50%/55%/60%
Banner	Blood Crawler Banner
Immune to
Coins	1 SC30 CCPre-Hardmode: 3 SC25 CCHardmode: 2 SC60 CC
Hurt
Killed
Idle

The Blood Crawler is a pre-Hardmode enemy commonly found in the Crimson. In addition to walking, it can crawl on background walls.

Notes

Blood Crawlers spawn six times more often on tiles that are in front of background walls,^[1] hence they are more likely to be encountered in the chasms of the Crimson than on the surface.
Like all spiders, Blood Crawlers cannot travel through a vertical 2-tile wide shaft.

Blood Crawler displayed on the Official Terraria Forums (Crimson style).

Blood Crawlers differ significantly from real-life spiders:
- They are able to drop Vertebrae, despite real spiders being invertebrates.
- They seem to have two eyes, but real spiders have eight eyes.
  - On the Official Terraria Forums artwork seen below, however, they appear to have two large eyes (seen on the in-game sprite) and six small ones, which complete the eight eyes.
Blood Crawlers resemble ticks, tiny parasitic arachnids who live off of the blood of other larger animals, including humans. Adult ticks have an elliptical lower body, called an idiosoma, which bloats in size when they feed on blood, similar to Blood Crawlers.
Like the Face Monster, it lacks a direct Corruption variant.

The Bestiary entry for the Blood Crawler: "Most spiders operate independently, but ones touched by the Crimson hive coordinate together to consume life."

Despite this statement, such a particularly coordinated behavior is not present in the AI of Blood Crawlers, in comparison to that of the other spiders.