A B757 IN BOS INGESTED BIRDS AT LIFTOFF.

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AT LIFTOFF WE SAW 2 BIRDS CROSS THE NOSE FROM L TO R. A MOMENT LATER WE HEARD A BANG. THE NOSE YAWED SLIGHTLY R AND IMMEDIATELY RECOVERED. BOTH ENGS LOOKED NORMAL AND ACFT FLEW NORMALLY. WE DECIDED TO CONTINUE WITH THE TURN AFTER TOF. I SUGGESTED WE LEVEL AT OUR INITIAL ALT OF 5000 FT. WE PROCEEDED TO CLEAN UP THE ACFT AND TWR CALLED AND INFORMED US THEY OBSERVED FLAME FROM THE REAR OF THE ENG FOR A SECOND. THE CABIN CREW DID THE SAME. THE CAPT DECIDED WE SHOULD CONTINUE CLBOUT. DEP CTL INFORMED US A VISUAL INSPECTION OF THE RWY WAS NEGATIVE FOR BIRDS; ETC. WHILE INVESTIGATING FURTHER; WE CALLED OUR DISPATCHER AND MAINT COORDINATOR. HE ELECTRONICALLY QUERIED THE ENG. (THIS PROVIDES HIM WITH MORE DATA THAN WE HAVE DISPLAYED.) HE TOLD US EVERYTHING LOOKED NORMAL AND BOTH HE AND THE DISPATCHER STATED THEY HAD NO OBJECTIONS TO THE FLT CONTINUING. I SUGGESTED THAT WE MAY HAVE UNSEEN DAMAGE AND THE MAINT COORDINATOR RESTATED THAT HE THOUGHT EVERYTHING WAS FINE. THE CAPT ELECTED TO CONTINUE TO DEST. POSTFLT INSPECTION REVEALED NO VISIBLE DAMAGE. BOTH ENGS OPERATED NORMALLY THROUGHOUT FLT.