What was found
DURING GEAR RETRACTION AND AFTER GEAR RETRACTED, WE HEARD A GRINDING NOISE AND SMELLED A STRONG ODOR THAT IS SIMILIAR TO SOMETHING BURNING (NOT ELECTRICAL). DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE FOR AN UNEVENTFUL LANDING. TURNED OUT WE HIT A SKUNK ON THE RUNWAY, AND A FLOCK OF GEESE? AIRBORNE BOTH ENGINES APPEAR TO NEED REPLACING? NO OVERWEIGHT LANDING. REMOVED AND REPLACED NR 2 ENG PER WORK CARDS 64T0700-2 AND PERFORMED ENG RUNS PER JRH. ALL WITHIN LIMITS OK FOR SERVICE.