using timer to change levels

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Uncle

You could try something along the lines of...

Open in online IDE

Graphics 800,600,0,2

global selectedBird=1 ; this is the variable you feed your case statement with
global startTime%=MilliSecs()

While Not Keydown(1) ; just a loop to test
   Cls
   If MilliSecs()>startTime+30000 then ; check for 30 second since we last changed.
      selectedBird=selectedBird+1
      if selectedBird>6 then selectedBird=1 ; loop back to 1 if we have reach the last bird
   endif
   Text 10,10,"Current Bird Is "+selectedBird
   Flip
Wend