AN MD80 FLT CREW EXPERIENCED A BIRD STRIKE ON TAKEOFF THAT RESULTED IN SOME ENGINE DAMAGE. THEY REDUCED THE ENGINE TO IDLE THRUST; DECLARED AN EMERGENCY AND RETURNED TO DEP ARPT.

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JUST PRIOR TO V1; A FLT ATTENDANT IN THE AFT CABIN CALLED TO RPT AN UNUSUAL VIBRATION -- THERE WERE NO ABNORMAL COCKPIT INDICATIONS. THE #1 FLT ATTENDANT (IN FIRST CLASS) STATED THERE WAS NOTHING UNUSUAL UP FRONT. CLBOUT WAS CONTINUED AS WE EVALUATED THE SITUATION. FLT ATTENDANT IN AFT CABIN CALLED TO RPT THE VIBRATION HAD DIMINISHED SIGNIFICANTLY. DURING CLBOUT; EACH SYS (L AND R) WAS LOOKED AT INDIVIDUALLY WITH NO DISCREPANCIES NOTED. PASSING ABOUT FL200; DURING A STEP CLB TO FL230; AN EXTREMELY SLIGHT 'BUMP' WAS FELT IN THE COCKPIT. A .01-.03 EPR FLUCTUATION WAS NOTED ON THE L ENG; ALL OTHER INDICATIONS WERE NORMAL. THIS BUMP WAS THOUGHT TO BE A COMPRESSOR STALL. QRH WAS REFED; DUE TO THE COMBINATION OF A POSSIBLE COMPRESSOR STALL AND VIBRATIONS RPTED BY THE FLT ATTENDANTS; THE ENG FIRE; DAMAGE; SEPARATION CHKLIST WAS ACCOMPLISHED. WHEN THE THROTTLE WAS RETARDED TO IDLE; VIBRATIONS STOPPED AND ALL ENG INDICATIONS WERE NORMAL. ENG REMAINED AT IDLE FOR THE REMAINDER OF THE FLT. AN EMER WAS DECLARED WITH CTR AND A REQUEST FOR A RETURN TO ZZZ WAS MADE. DSCNT; APCH; AND LNDG WERE NORMAL. AFTER INSPECTION BY EMER RESPONSE CREW ACFT WAS TAXIED TO THE GATE. WITH THE EXCEPTION OF THE L ENG AT IDLE FOR THE RETURN TO ZZZ; THERE WAS NO DEV FROM ANY FAR; OPERATING LIMIT OR PROC. I AM UNAWARE OF ANY TFC PRIORITY BEING ASSIGNED. UPON INSPECTION; MAINT RPTED FINDING BIRD REMAINS ON THE L ENG COWLING/INTAKE/INLET GUIDE VANES.