Australian Pied budgerigar mutation spot, clear areas on the wings and a clear area on the breast. They differ from the Clearflight Pied in the nape spot, which is not always present, and in their feet, which are usually pink. But the main point of difference is in the clear area of the body, which in the Australian Pied is located in the middle or lower breast, with the upper breast being always normally coloured, so that there is a clear division between the mask and the breast, just as in normal birds. In the Clearflight Pied the clear area on the breast, if
Pied-piping Apparently, the Left Branch Condition is absent from Russian. The second example illustrating variation in pied-piping across languages is from German. Relative pronouns in German at times have the option to pied-pipe a governing "zu"-infinitive when they are fronted, e.g. The a-sentence has the relative pronoun "das" pied-piping the zu-infinitive "zu lesen" to the front of the relative clause, whereas this pied-piping does not occur in the b-sentence. Since both variants are acceptable, pied-piping in such cases is optional. In English in contrast, pied-piping in such constellations is impossible, e.g. "*the book which to read I tried" and "*the book