A closssssse encounter: Thomas Bird, left, 6, and his sisters Elizabeth, 5, and Rebecca, 4, of Beaver, Pa., pet a rescued red-tailed boa during the 14th annual ALCOSAN Open House on Saturday. (Photo by Lake Fong/Post-Gazette) #Pittsburgh #PGH #412 #ALCOSANOpenHouse #ALCOSAN #boa #boaconstrictor #redtailedboa #redtailedboaconstrictor #PGPhotos