5 DEFINT A-Z
7 RANDOMIZE VAL(MID$(TIME$,7,2))
8 CLS
10 WHILE 1=1
15    BIRD = INT(RND*4)+1
18    LOCATE 1,1
20    ON BIRD GOTO 30, 40, 50, 60
30    GOSUB 200  : GOTO 100
40    GOSUB 400  : GOTO 100
50    GOSUB 600  : GOTO 100
60    GOSUB 1000 : GOTO 100
100   IF INKEY$ <> "" THEN STOP
105   SOUND 32000,RND*50+20
110   IF RND>.95 THEN SOUND 32000,RND*500
112   PRINT BIRD
115   IF INKEY$ <> "" THEN STOP
120 WEND
130 STOP
180 '
190 '***************** bird1 *****************
200 PLAY "l64 mb ml t255 n64n66n68n70 p64"
210 PLAY "l64 mb ml t255 n66n68n70n72n74n76n78 p64"
220 PLAY "l64 mb ml t255 n66n68n70n72 p64"
230 PLAY "l64 mb ml t255 n64n66n68n70 p64"
240 PLAY "l64 mb ml t255 n70n72n74n76n78n80 p64"
250 PLAY "l64 mb ml t255 n66n68n70n72 p64"
260 RETURN
380 '
390 ' *************** bird2 ****************
400 PLAY " mf ml l62 t255 n64n66n68n70 p64"
410 PLAY " mf ml l62 t255 n66n68n70n72n74n76n78 p64"
420 PLAY "mf ml l62 t255 n64n66n68n70 p64"
430 PLAY "mf ml l62 t255 n70n72n74n76n78n80 p64"
440 '
450 PLAY " mf ml l62 t255 n64n66n68n70 p64"
460 PLAY " mf ml l62 t255 n66n68n70n72n74n76n78 p64"
470 PLAY "mf ml l62 t255 n64n66n68n70 p64"
480 PLAY "mf ml l62 t255 n70n72n74n76n78n80 p64"
490 '
500 PLAY "mf ml l62 t255 n66n70n66n70n66n70n74n74"
510 PLAY "mf ml l62 t255 n66n70n66n70n66n70n74n74"
550 RETURN
590 ' **************** bird4 *********************
600 'Song Sparrow  (Wallace Intro to Orn.  Macmillan pg 406)
610 PLAY "l50 mb ml t255 o5 f#gf#gp64 f#gf#gp64 "
620 PLAY "l50 mb ml t255 o5 f#gf#gp64 f#gf#gp64 "
630 PLAY "l50 mb ml t255 o5 aa#ba#aa#ba#a"
640 PLAY "l50 mb ml t255 o5 p32 bbbbbb p64"
650 PLAY "l50 mb ml t255 o5 f#gp64 f#gp64 f#gp64 f#gp64 f#g "
690 RETURN
990 ' ***************** bird5 ********************
1000 'Eastern Meadow Lark  (Wallace Intro to Orn.  Macmillan pg 406)
1010 PLAY "l60 mb ml t255 o5 g+g+a g+g+a g+g+a g+g+a"
1020 PLAY "l60 mb ml t255 o5 g+g+a g+g+a g+g+a g+g+a p32"
1030 PLAY "l60 mb ml t255 o5 b-b-bb-b-bb-b-b"
1040 PLAY "l60 mb ml t255 o5 b-b-bb-b-bb-b-bp32"
1050 PLAY "l60 mb ml t255 o5 a+a+aa+aa+ aa a- g+g+ g g-g f+f+ fff+fff+f p64"
1090 RETURN