diff --git a/code/modules/mob/living/simple_animal/hostile/alien.dm b/code/modules/mob/living/simple_animal/hostile/alien.dm
index f89f5316450..cea389a745d 100644
--- a/code/modules/mob/living/simple_animal/hostile/alien.dm
+++ b/code/modules/mob/living/simple_animal/hostile/alien.dm
@@ -14,6 +14,7 @@
 	organ_names = list("chest", "lower body", "left arm", "right arm", "left leg", "right leg", "head")
 	maxHealth = 100
 	health = 100
+	blood_type = "#5BDD04"
 	harm_intent_damage = 5
 	melee_damage_lower = 25
 	melee_damage_upper = 25
diff --git a/code/modules/mob/living/simple_animal/hostile/giant_spider.dm b/code/modules/mob/living/simple_animal/hostile/giant_spider.dm
index de775d3603f..9123dda8972 100644
--- a/code/modules/mob/living/simple_animal/hostile/giant_spider.dm
+++ b/code/modules/mob/living/simple_animal/hostile/giant_spider.dm
@@ -26,6 +26,7 @@
 	response_help  = "pets"
 	response_disarm = "gently pushes aside"
 	response_harm   = "pokes"
+	blood_type = "#5BDD04"
 	blood_amount = 150
 	stop_automated_movement_when_pulled = 0
 	maxHealth = 200
diff --git a/code/modules/mob/living/simple_animal/hostile/retaliate/cavern.dm b/code/modules/mob/living/simple_animal/hostile/retaliate/cavern.dm
index 3e3ae53e3b2..4c5ef98db8b 100644
--- a/code/modules/mob/living/simple_animal/hostile/retaliate/cavern.dm
+++ b/code/modules/mob/living/simple_animal/hostile/retaliate/cavern.dm
@@ -20,6 +20,7 @@
 
 	health = 60
 	maxHealth = 60
+	blood_type = "#006666"
 	melee_damage_lower = 10
 	melee_damage_upper = 10
 	attacktext = "chomped"
diff --git a/code/modules/mob/living/simple_animal/hostile/spider_queen.dm b/code/modules/mob/living/simple_animal/hostile/spider_queen.dm
index 7422d73dbc4..f8152ca6703 100644
--- a/code/modules/mob/living/simple_animal/hostile/spider_queen.dm
+++ b/code/modules/mob/living/simple_animal/hostile/spider_queen.dm
@@ -20,6 +20,7 @@
 	response_help  = "pets"
 	response_disarm = "gently pushes aside"
 	response_harm   = "pokes"
+	blood_type = "#5BDD04"
 	blood_overlay_icon = null
 	stop_automated_movement_when_pulled = 0
 	maxHealth = 1100
diff --git a/html/changelogs/wickedcybs_bugblood.yml b/html/changelogs/wickedcybs_bugblood.yml
new file mode 100644
index 00000000000..fba94dab7f8
--- /dev/null
+++ b/html/changelogs/wickedcybs_bugblood.yml
@@ -0,0 +1,6 @@
+author: WickedCybs
+
+delete-after: True
+
+changes:
+  - tweak: "Greimorians, cavern dwellers and certain other aliens now bleed shades of green blood instead of red blood."
diff --git a/icons/mob/npc/greimorian.dmi b/icons/mob/npc/greimorian.dmi
index b1e73854df0..e43c3d7ba48 100644
Binary files a/icons/mob/npc/greimorian.dmi and b/icons/mob/npc/greimorian.dmi differ
diff --git a/icons/mob/npc/spider_queen.dmi b/icons/mob/npc/spider_queen.dmi
index 07d44a50214..1305fc4887d 100644
Binary files a/icons/mob/npc/spider_queen.dmi and b/icons/mob/npc/spider_queen.dmi differ