diff --git a/packages/ludic.nav/README.md b/packages/ludic.nav/README.md
index 59c4541d..a873c946 100644
--- a/packages/ludic.nav/README.md
+++ b/packages/ludic.nav/README.md
@@ -75,7 +75,7 @@ the PC (Git Bash, the LLVM installer's clang). `native/LICENSE-recastnavigation`
 ## Crowds (phase 18)
 
 `nav_crowd_start(kind, max, max_radius)` puts a DetourCrowd on a kind's mesh, with the mesh's tastes as
-its filters. `nav_crowd_add(kind, x, y, z, radius, height, speed, filter)` adds a walker (snapped to
+its filters. `nav_crowd_add(kind, x, y, z, radius, height, speed, filter, separation)` adds a walker (snapped to
 the mesh, -1 off it), `nav_crowd_target` and `nav_crowd_speed` say where and how fast, and
 `nav_crowd_step(dt)` steps every crowd. `nav_crowd_read` puts a walker into `nav_agent_x/y/z/vx/vz`,
 and `nav_crowd_us()` is what the stepping has cost. The mechanic decides and the crowd moves, and
diff --git a/packages/ludic.nav/crowd.ludic b/packages/ludic.nav/crowd.ludic
index f0930676..519ead41 100644
--- a/packages/ludic.nav/crowd.ludic
+++ b/packages/ludic.nav/crowd.ludic
@@ -20,11 +20,12 @@ function nv_crowd_drop(nav_st: mut NavState, kind: int) -> void {
   nav_st.nv_crowds[kind] = null
 }
 
-# a walker at (x, y, z) with its width, height, top speed and taste: its index, or -1
-export function nav_crowd_add(nav_st: NavState, kind: int, x: float, y: float, z: float, radius: float, height: float, speed: float, filter: int) -> int {
+# a walker at (x, y, z) with its width, height, top speed, taste and how hard it keeps its distance
+# from the others (2 an ordinary walker): its index, or -1
+export function nav_crowd_add(nav_st: NavState, kind: int, x: float, y: float, z: float, radius: float, height: float, speed: float, filter: int, separation: float) -> int {
   let c = nv_crowd(nav_st, kind)
   if c == null { return -1 }
-  return nvc_crowd_add(c, x, y, z, radius, height, speed, filter)
+  return nvc_crowd_add(c, x, y, z, radius, height, speed, filter, separation)
 }
 export function nav_crowd_remove(nav_st: NavState, kind: int, i: int) -> void {
   let c = nv_crowd(nav_st, kind)
diff --git a/packages/ludic.nav/lib/macos-arm64/libludicnav.dylib b/packages/ludic.nav/lib/macos-arm64/libludicnav.dylib
index 214b2e5a..474332e5 100755
--- a/packages/ludic.nav/lib/macos-arm64/libludicnav.dylib
+++ b/packages/ludic.nav/lib/macos-arm64/libludicnav.dylib
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:0994fc60f85002f8c95ed2a8a75886a94ce8abb46950248f8a6fa42a81bf3538
+oid sha256:82c2b394bc9a6640055be28ce5172057b665759828e499d057df0cffe94aa05a
 size 198320
diff --git a/packages/ludic.nav/lib/windows-x64/ludicnav.dll b/packages/ludic.nav/lib/windows-x64/ludicnav.dll
index b0c6761f..253cf5f0 100644
--- a/packages/ludic.nav/lib/windows-x64/ludicnav.dll
+++ b/packages/ludic.nav/lib/windows-x64/ludicnav.dll
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:a7626d464f2588054610dc27a655d67acf66649ea120120705cdf5f1fca5fe34
+oid sha256:1a0eea4d94669a548e4874c07bc23caa321bf891f7a724331163e64f10006099
 size 374784
diff --git a/packages/ludic.nav/native.ludic b/packages/ludic.nav/native.ludic
index 7414cfb5..0f1db0f2 100644
--- a/packages/ludic.nav/native.ludic
+++ b/packages/ludic.nav/native.ludic
@@ -17,7 +17,7 @@ extern function nvc_random_near(h: pointer, f: int, x: float, y: float, z: float
 extern function nvc_stage(size: int) -> pointer = "nav_stage"
 extern function nvc_crowd_new(h: pointer, max: int, max_radius: float) -> pointer = "nav_crowd_new"
 extern function nvc_crowd_free(c: pointer) -> void = "nav_crowd_free"
-extern function nvc_crowd_add(c: pointer, x: float, y: float, z: float, radius: float, height: float, speed: float, filter: int) -> int = "nav_crowd_add"
+extern function nvc_crowd_add(c: pointer, x: float, y: float, z: float, radius: float, height: float, speed: float, filter: int, separation: float) -> int = "nav_crowd_add"
 extern function nvc_crowd_remove(c: pointer, i: int) -> void = "nav_crowd_remove"
 extern function nvc_crowd_target(c: pointer, i: int, x: float, y: float, z: float) -> int = "nav_crowd_target"
 extern function nvc_crowd_speed(c: pointer, i: int, speed: float) -> void = "nav_crowd_speed"
diff --git a/packages/ludic.nav/native/shim/nav_crowd.inl b/packages/ludic.nav/native/shim/nav_crowd.inl
index 7c6585b9..178df676 100644
--- a/packages/ludic.nav/native/shim/nav_crowd.inl
+++ b/packages/ludic.nav/native/shim/nav_crowd.inl
@@ -24,8 +24,9 @@ NAV_SHIM void nav_crowd_free(void *p) {
   delete c;
 }
 
-// a walker at (x, y, z): its index, or -1 when the crowd is full or the point is off the mesh
-NAV_SHIM int nav_crowd_add(void *p, float x, float y, float z, float radius, float height, float speed, int filter) {
+// a walker at (x, y, z): its index, or -1 when the crowd is full or the point is off the mesh;
+// separation is how hard it keeps its distance (a herd animal more than a loner)
+NAV_SHIM int nav_crowd_add(void *p, float x, float y, float z, float radius, float height, float speed, int filter, float separation) {
   Crowd *c = static_cast<Crowd *>(p);
   dtCrowdAgentParams ap;
   memset(&ap, 0, sizeof(ap));
@@ -35,7 +36,7 @@ NAV_SHIM int nav_crowd_add(void *p, float x, float y, float z, float radius, flo
   ap.maxAcceleration = speed * 4.0f;
   ap.collisionQueryRange = radius * 12.0f;
   ap.pathOptimizationRange = radius * 30.0f;
-  ap.separationWeight = 2.0f;
+  ap.separationWeight = separation;
   ap.updateFlags = DT_CROWD_ANTICIPATE_TURNS | DT_CROWD_OBSTACLE_AVOIDANCE | DT_CROWD_SEPARATION | DT_CROWD_OPTIMIZE_TOPO | DT_CROWD_OPTIMIZE_VIS;
   ap.obstacleAvoidanceType = 3;
   ap.queryFilterType = (unsigned char)(filter >= 0 && filter < NAV_FILTERS ? filter : 0);
diff --git a/packages/ludic.nav/tests/crowd_test.ludic b/packages/ludic.nav/tests/crowd_test.ludic
index 4e0fc3d6..183e87cd 100644
--- a/packages/ludic.nav/tests/crowd_test.ludic
+++ b/packages/ludic.nav/tests/crowd_test.ludic
@@ -25,7 +25,7 @@ program CrowdTest {
         x0 = 36.0
         x1 = 4.0
       }
-      let id = nav_crowd_add(nav_st, NAV_PERSON, x0, 0.0, z, 0.35, 1.8, 1.4, 0)
+      let id = nav_crowd_add(nav_st, NAV_PERSON, x0, 0.0, z, 0.35, 1.8, 1.4, 0, 2.0)
       expect(id >= 0)
       expect(nav_crowd_target(nav_st, NAV_PERSON, id, x1, 0.0, z))
       push(ct.ids, id)
@@ -73,12 +73,12 @@ program CrowdTest {
     expect(not nav_crowd_start(nav_st, NAV_PERSON, 8, 0.6))
     expect(nav_build(nav_st, NAV_PERSON, ground(40, 0), new NavConfig))
     expect(nav_crowd_start(nav_st, NAV_PERSON, 8, 0.6))
-    expect_eq(nav_crowd_add(nav_st, NAV_PERSON, -50.0, 0.0, -50.0, 0.35, 1.8, 1.4, 0), -1)
-    let a = nav_crowd_add(nav_st, NAV_PERSON, 5.0, 0.0, 5.0, 0.35, 1.8, 1.4, 0)
+    expect_eq(nav_crowd_add(nav_st, NAV_PERSON, -50.0, 0.0, -50.0, 0.35, 1.8, 1.4, 0, 2.0), -1)
+    let a = nav_crowd_add(nav_st, NAV_PERSON, 5.0, 0.0, 5.0, 0.35, 1.8, 1.4, 0, 2.0)
     expect(a >= 0)
     expect(not nav_crowd_target(nav_st, NAV_PERSON, a, -50.0, 0.0, -50.0))
     nav_drop(nav_st, NAV_PERSON)
     expect(not nav_crowd_read(nav_st, NAV_PERSON, a))
-    expect_eq(nav_crowd_add(nav_st, NAV_PERSON, 5.0, 0.0, 5.0, 0.35, 1.8, 1.4, 0), -1)
+    expect_eq(nav_crowd_add(nav_st, NAV_PERSON, 5.0, 0.0, 5.0, 0.35, 1.8, 1.4, 0, 2.0), -1)
   }
 }
diff --git a/packages/ludic.wildlife/species.ludic b/packages/ludic.wildlife/species.ludic
index aa72763e..882330a9 100644
--- a/packages/ludic.wildlife/species.ludic
+++ b/packages/ludic.wildlife/species.ludic
@@ -30,6 +30,7 @@ export property WildSpecies {
   keep_away: float = 60.0    # how far its ranges keep from where the valley starts, m
   range: float = 100.0       # how wide one of its ranges is, m
   scale: float = 1.0         # its size, times
+  spacing: float = 2.0       # how much room it keeps from others walking by (a herd more): a crowd's separation
 }
 
 export state WildlifeState {