Walnuts roller is also known by the name harzers as a descendant of German walnut developed in Hartz Mountains. Called roller because ngerol voice continued. When the sound of the birds did not ceasing issued various rhythms that tone varies greatly, from a high-pitched tone to low and melodious sound.
Roller body length of about 7.5 cm. Characteristic as shown in the bubble songbird voice contained under the chin. Sections were very visible and is almost the same as the head. Feather rollers that are often found in green and there are stripes on the back type walnuts also developed in the Netherlands, better known by the name saksicsh, besides developed in Belgium.
Baca selengkapnya: ciri-ciri kenari roller