How long is the shell bird a year?

Bird birds can be called about 10 months a year. Only in the change of feathers, especially in July and August.The scientific name of this bird is a coal -ribbon, a small bird who likes to stay in the coniferous forest, with a length of about 11 cm.The male and female appearance of this bird is close, with a lively personality, not very afraid of people. The general flight speed is slow, and the flight distance is not long.