diff --git a/src/modules/butterflies/butterflies_overlays.c b/src/modules/butterflies/butterflies_overlays.c
index 2f218bb10223548950e34f4be08809df2596066e..a52fc744452c847356cd7f2f839c7c019aab9e96 100644
--- a/src/modules/butterflies/butterflies_overlays.c
+++ b/src/modules/butterflies/butterflies_overlays.c
@@ -25,6 +25,8 @@ enum action_status bf_grid_overlay_update(const struct cats_configuration *conf,
         int64_t cells_excluded = 0;
         int64_t cells_resource_ok = 0;
         int64_t cells_habitat_and_resource_ok = 0;
+        int64_t cells_eggs_removed = 0;
+        int64_t cells_adults_removed = 0;
 
         for (cats_dt_coord row = 0; row < rows; row++) {
                 for (cats_dt_coord col = 0; col < cols; col++) {
@@ -33,6 +35,8 @@ enum action_status bf_grid_overlay_update(const struct cats_configuration *conf,
 
                         if (cell_excluded_by_overlay(conf, row, col)) {
                                 data->info_layer[row][col] |= BF_CELL_EXCLUDED;
+                                if (data->eggs[row][col]) cells_eggs_removed += 1;
+                                if (get_adult_population(grid, row, col)) cells_adults_removed += 1;
                                 data->eggs[row][col] = 0;
                                 set_population_ignore_cc(grid, row, col, 0);
                                 cells_excluded += 1;
@@ -58,6 +62,8 @@ enum action_status bf_grid_overlay_update(const struct cats_configuration *conf,
                                 cells_habitat_and_resource_ok += 1;
 
                         } else {
+                                if (data->eggs[row][col]) cells_eggs_removed += 1;
+                                if (get_adult_population(grid, row, col)) cells_adults_removed += 1;
                                 data->eggs[row][col] = 0;
                                 set_population_ignore_cc(grid, row, col, 0);
                         }
@@ -79,6 +85,9 @@ enum action_status bf_grid_overlay_update(const struct cats_configuration *conf,
 
         log_message(LOG_INFO, "Overlay update: %ld excluded, %ld habitat ok, %ld resource ok, %ld habitat + resource ok",
                     cells_excluded, cells_habitat_ok, cells_resource_ok, cells_habitat_and_resource_ok);
-        log_message(LOG_INFO, "Overlay update %ld cells with eggs, total %f eggs, average %f eggs per cell", cells_with_eggs, total_eggs, total_eggs/(float) cells_with_eggs);
+        log_message(LOG_INFO, "Overlay update: %ld cells with eggs, total %f eggs, average %f eggs per cell", cells_with_eggs, total_eggs, total_eggs/(float) cells_with_eggs);
+        log_message(LOG_INFO, "Overlay update: %ld cells with eggs removed", cells_eggs_removed );
+        log_message(LOG_INFO, "Overlay update: %ld cells with adults removed", cells_adults_removed );
         return ACTION_RUN;
 }
+