ABAP : Type & Like

types : t_ant(10) TYPE c,
        t_antX    TYPE t_ant,  " correct
*        t_anty like t_ant,    " incorrect
        t_antY    TYPE t_antX. " correct
*        t_antZ    LIKE t_antX. " incorrect
" every declare can not use like for reference

DATA  : d_bird(10)  TYPE c,
*        d_birdX      TYPE d_bird,  "incorect
        d_birdY     TYPE t_ant,     "correct
        d_birdZ     LIKE d_bird.    "correct