The commercial pilot reported that after departing on a Title 14, CFR Part 91 personal cross-country flight, he heard a thump, and he elected to return to his departure airport to investigate. A postflight inspection revealed damage to the airplane’s outboard portion of the right wing, with bird feathers and blood imbedded in the leading edge. A subsequent maintenance examination revealed structural damage to the airplane’s right wing spar. The pilot indicated there were no preaccident mechanical problems with the airplane.