Duplicating two or more mc

[FONT=Calibri][SIZE=3]Hi, I am tring to create a movie clip in which different coloured birds are flying…[/SIZE][/FONT]
[FONT=Calibri][SIZE=3]I am tring to duplicate two or more MovieClips at the same time…but only either of them Works[/SIZE][/FONT]
[FONT=Calibri][SIZE=3]How should I modify the code so that I can achieve that ?[/SIZE][/FONT]
[FONT=Calibri][SIZE=3] [/SIZE][/FONT]

function birds() {
                for (m=1; m<=10; m++) {
                               firstEnem y= "bird"+1;
                               secondEnemy = "bird"+2;
                               _root.bird1.duplicateMovieClip(firstEnemy, m);
                               _root.bird2.duplicateMovieClip(secondEnemy, m);