31. In combination with the Dark budgerigar mutation the body feathers become deeper shades of blue. 32. Because the Dark factor is always visibly expressed no budgerigar can be split for Dark. 33. Because the Violet factor is always visibly expressed no budgerigar can be split for Violet. 34. Because the Anthracite factor is always visibly expressed no budgerigar can be split for Anthracite. 35. From 1925 Duncker collaborated with Carl Hubert Cremer and extended his experiments to include budgerigars . 36. But only the creme de la creme of parakeets, or budgerigars , will be considered. 37. The condition is caused by young budgerigars slipping repeatedly on the floor of a nest box. 38. Birds include the Australian hobby, nankeen kestrel, spotted harrier, mulga parrot and budgerigars . 39. I was recently given a budgerigar . 40. Currently, most owners wishing to obtain an Anthracite need to import these budgerigars from Germany.
