a heterozygous white (bb) yearly is crossed with homozygous white ship (bb)
white_rook is white_chess_piece. black_and_white_warbler is bird. white_rook is rook. heterozius is crab. white_winged_vampire_bat is bat. white_rumped_shrike is butcherbird. black_sox is white_sox. white_winged_vampire_bat is vampire_bat. negro_league is professional_sports_league. white_winged_vampire_bat is mammal.