diff --git a/screen.c b/screen.c
index 05fdffe..e8e81b1 100644
--- a/screen.c
+++ b/screen.c
@@ -46,19 +46,28 @@ void cuadra(WINDOW * win, int width, int height){
     wrefresh(win);
 }
 
-void generarElefantes(struct coord *buff){
-    srand ( time(NULL) );
+struct coord randomCoord(WINDOW * win){
+    int nWidthMax=width-10;
+    int nWidthMin=10;
+    int nHeightMax=height-10;
+    int nHeightMin=10;
+
+    int rX = rand() % ((nWidthMax+1)-nWidthMin) + nWidthMin;
+    int rY = rand() % ((nHeightMax+1)-nHeightMin) + nHeightMin;
+
+    struct coord res = {rX, rY};
+
+    if (mvwinch(win, res.y, res.x) == ' '){
+        return res;
+    } else {
+        randomCoord(win);
+    }
+}
+
+void generarElefantes(WINDOW * win, struct coord *buff){
 
     for(int i = 0; i < ELEFANTES; ++i) {
-        int nWidthMax=width-10;
-        int nWidthMin=10;
-        int nHeightMax=height-10;
-        int nHeightMin=10;
-
-        int rX = rand() % ((nWidthMax+1)-nWidthMin) + nWidthMin;
-        int rY = rand() % ((nHeightMax+1)-nHeightMin) + nHeightMin;
-
-        struct coord elefante = {rX+2,rY+2};
+        struct coord elefante = randomCoord(win);
         buff[i] = elefante;
     }
 }
@@ -67,6 +76,7 @@ int screen() {
     initscr();
     noecho();
     curs_set(0); //cursor invisible
+    srand ( time(NULL) ); //semilla para rand
 
     /* int height, width, start_y, start_x; */
     /* height = 40; */
@@ -87,11 +97,10 @@ int screen() {
     mvwprintw(win, cazador.y, cazador.x, "^");
 
     struct coord elefantes[ELEFANTES] = {0};
-    generarElefantes(elefantes);
+    generarElefantes(win, elefantes);
 
     for(int i = 0; i < ELEFANTES; i++){
         mvwprintw(win, elefantes[i].y, elefantes[i].x, "?");
-
         /* mvwprintw(win, i+1, 1, "elefante x:%i, y:%i",elefantes[i].x, elefantes[i].y); */
     }
 
@@ -154,8 +163,6 @@ int screen() {
                 }
             }
         }
-
-      
     }
 
     endwin(); // dealocate memory and end ncurses