diff --git a/data/json/monsters/zed-pupating.json b/data/json/monsters/zed-pupating.json
index f91e5faf54bd4..cd6e145d79967 100644
--- a/data/json/monsters/zed-pupating.json
+++ b/data/json/monsters/zed-pupating.json
@@ -12,7 +12,7 @@
     "bleed_rate": 50,
     "special_attacks": [ { "type": "bite", "cooldown": 3 } ],
     "regenerates": 10,
-    "extend": { "flags": [ "SLUDGETRAIL", "SLUDGEPROOF" ] }
+    "extend": { "flags": [ "SMALLSLUDGETRAIL", "SLUDGEPROOF" ] }
   },
   {
     "id": "mon_zombie_crawler_pupa",
@@ -44,7 +44,7 @@
     "bleed_rate": 50,
     "special_attacks": [ { "type": "bite", "cooldown": 3 } ],
     "regenerates": 10,
-    "extend": { "flags": [ "SLUDGETRAIL", "SLUDGEPROOF" ] }
+    "extend": { "flags": [ "SMALLSLUDGETRAIL", "SLUDGEPROOF" ] }
   },
   {
     "id": "mon_zombie_pupa",
@@ -73,7 +73,7 @@
     "speed": 95,
     "regenerates": 10,
     "upgrades": { "half_life": 21, "into_group": "GROUP_BRUTE_PUPA" },
-    "extend": { "flags": [ "SLUDGETRAIL", "SLUDGEPROOF" ] }
+    "extend": { "flags": [ "SMALLSLUDGETRAIL", "SLUDGEPROOF" ] }
   },
   {
     "id": "mon_brute_pupa",
@@ -137,7 +137,7 @@
       "REVIVES",
       "PUSH_MON",
       "PUSH_VEH",
-      "SLUDGETRAIL",
+      "SMALLSLUDGETRAIL",
       "SLUDGEPROOF",
       "FILTHY"
     ]
@@ -195,7 +195,7 @@
       "REVIVES",
       "PUSH_MON",
       "PUSH_VEH",
-      "SLUDGETRAIL",
+      "SMALLSLUDGETRAIL",
       "SLUDGEPROOF",
       "FILTHY"
     ]
@@ -215,7 +215,7 @@
     "bleed_rate": 0,
     "vision_day": 8,
     "vision_night": 15,
-    "extend": { "flags": [ "SLUDGETRAIL", "SLUDGEPROOF", "NIGHT_INVISIBILITY" ] }
+    "extend": { "flags": [ "SMALLSLUDGETRAIL", "SLUDGEPROOF", "NIGHT_INVISIBILITY" ] }
   },
   {
     "id": "mon_zombie_pupa_shady",
diff --git a/doc/JSON_FLAGS.md b/doc/JSON_FLAGS.md
index 7c75993b77649..af0ad7b09603b 100644
--- a/doc/JSON_FLAGS.md
+++ b/doc/JSON_FLAGS.md
@@ -971,6 +971,7 @@ Other monster flags.
 - ```SHEARABLE``` This monster can be sheared for wool.
 - ```SLUDGEPROOF``` Ignores the effect of sludge trails.
 - ```SLUDGETRAIL``` Causes the monster to leave a sludge trap trail when moving.
+- ```SMALLSLUDGETRAIL``` Causes the monster to occasionally leave a 1-tile sludge trail when moving.
 - ```SMELLS``` It can smell you.
 - ```STUMBLES``` Stumbles in its movement.
 - ```SUNDEATH``` Dies in full sunlight.
diff --git a/src/monmove.cpp b/src/monmove.cpp
index 3ea2800dd6ef2..7fdc4face1c6d 100644
--- a/src/monmove.cpp
+++ b/src/monmove.cpp
@@ -1755,6 +1755,12 @@ bool monster::move_to( const tripoint &p, bool force, bool step_on_critter,
         }
     }
 
+    if( has_flag ( MF_SMALLSLUDGETRAIL ) ) {
+        if( one_in( 2 ) ) {
+            here.add_field( pos(), fd_sludge, 1 );
+        }
+    }
+
     if( has_flag( MF_DRIPS_NAPALM ) ) {
         if( one_in( 10 ) ) {
             // if it has more napalm, drop some and reduce ammo in tank
diff --git a/src/monstergenerator.cpp b/src/monstergenerator.cpp
index 352c976c45909..69caaafe9ca9c 100644
--- a/src/monstergenerator.cpp
+++ b/src/monstergenerator.cpp
@@ -130,6 +130,7 @@ std::string enum_to_string<m_flag>( m_flag data )
         case MF_FIREPROOF: return "FIREPROOF";
         case MF_SLUDGEPROOF: return "SLUDGEPROOF";
         case MF_SLUDGETRAIL: return "SLUDGETRAIL";
+        case MF_SMALLSLUDGETRAIL: return "SMALLSLUDGETRAIL";
         case MF_COLDPROOF: return "COLDPROOF";
         case MF_FIREY: return "FIREY";
         case MF_QUEEN: return "QUEEN";
diff --git a/src/mtype.h b/src/mtype.h
index 09d71eba54263..56876bf2d4fb5 100644
--- a/src/mtype.h
+++ b/src/mtype.h
@@ -100,6 +100,7 @@ enum m_flag : int {
     MF_FIREPROOF,           // Immune to fire
     MF_SLUDGEPROOF,         // Ignores the effect of sludge trails
     MF_SLUDGETRAIL,         // Causes monster to leave a sludge trap trail when moving
+    MF_SMALLSLUDGETRAIL,    // Causes monster to leave a low intensity, 1 tile sludge pool approximately every other tile when moving
     MF_COLDPROOF,           // Immune to cold damage
     MF_FIREY,               // Burns stuff and is immune to fire
     MF_QUEEN,               // When it dies, local populations start to die off too