GLF2 CREW HIT 12 CANADIAN GEESE ON A GAR; WHILE ATTEMPTING TO AVOID A LARGE FLOCK WHILE ON APCH TO OTH.

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ACFT WAS ON VERY SHORT FINAL WHEN LARGE FLOCK OF MIGRATORY BIRDS FLEW INTO ACFT PATH. COLLISION FOLLOWED. APPROX 12 BIRDS HIT. DAMAGE TO ACFT OCCURRED. THE CAPT SPOKE BY TELEPHONE WITH THE LCL FBO AND QUERIED THE FBO PERSONNEL AS TO LCL INFO WHICH MIGHT ASSIST AND OR MAKE THE FLT SAFER. NO INFO WAS PROVIDED CONCERNING MIGRATORY BIRDS OR ANY OTHER HAZARD EXCEPT FOR SOME TXWY CONSTRUCTION INFO. NO FLT PLAN WAS FILED FOR THE 30 MIN FLT. HILLSBORO TWR PROVIDED A VFR HDOF TO PORTLAND APCH CTL; WHO IN TURN PROVIDED A DISCRETE XPONDER CODE; VFR FLT FOLLOWING AND SUBSEQUENT HDOFS FOR THE DURATION OF THE FLT. THE FLT WAS PRINCIPALLY CONDUCTED AT 16500 FT IN VFR CONDITIONS. SKY CONDITIONS WERE CLR WITH UNRESTR VISIBILITIES FOR DEP AND ENRTE PHASES OF THE FLT. AFTER COMPLETION OF ALL CHKLISTS; THE LETDOWN WAS INITIATED. WE MONITORED AWOS AND COMMON TFC FOR NORTH BEND; BUT THE AWOS WAS DELIVERED VIA RELAY FROM THE ENRTE CTLR. AT APPROX; 10 MI NE OF THE FIELD; AWOS WAS AGAIN; PROVIDED BY PORTLAND APCH AT THE INITIATION OF A FREQ CHANGE. SKY CLR; 6 MI VISIBILITY; WIND 340 DEGS AT 11 KTS. WE ELECTED TO FLY FULL L TFC TO RWY 4. WE COMMUNICATED INTENTIONS ON CTAF. A MIL HELI; WAS ALSO OPERATING AT THE ARPT. WE HAD VISUAL CONTACT WITH HELI AND THEY ACKNOWLEDGED HAVING THE SAME OVER CTAF FREQ. THE HELI CREW XMITTED OVER CTAF THAT THEY WOULD SEQUENCE #2 AND FOLLOW US TO THE ARPT. WE FLEW A NORMAL TFC PATTERN; FLEW THE VASI TOWARDS THE TOUCHDOWN ZONE. THE COPLT WAS MONITORING THE APCH. AT THIS POINT; I NOTICED WHAT APPEARED TO BE SEVERAL HUNDRED LARGE BIRDS (CANADIAN GEESE) RISE UP FROM THE GRASS AT THE APCH END OF THE RWY. I IMMEDIATELY COMMANDED AND INITIATED A GAR. THE COPLT SUPPORTED THIS EFFORT. SEVERAL GEESE COLLIDED WITH THE ACFT. NO GEESE APPEARED TO FLY OVER THE ACFT. WE FLEW ANOTHER STANDARD TFC PATTERN; COMMUNICATED ON THE COMMON TFC FREQ AND LANDED WITHOUT EVENT. UPON DEPLANING AND INSPECTION; MULTIPLE BIRD STRIKES WERE NOTED. SOME CAUSING DAMAGE AND OTHERS; BLOOD AND DEBRIS ON THE ACFT'S UNDER SURFACES; OF THE ESTIMATED 12 IMPACT POINTS.