Blue tit . ( Dim. of herrero , by the metal grating of singing). 1. d. bird of about twelve centimeters long from beak to the tip of the tail, and two major decimetres; Blue head, NAPE and white eyebrow, I Loin of blue-green color, chest and abdomen yellow with a black spot at the latest, dark brown with blackish legs and the whitetip peak. It is insectivorous and quite common in Spain. 2. d. bird of about fifteen centimeters long from beak to the tip of the tail, and three major decimetres; head and spine of color blue, neck and white cheeks, chest and abdomen, bermejos, a black stripe from the corners of the mouth to the neck, brownish beak and legs are yellowish. It is insectivorous, common in Spain, and makes the nest of mud and in the form of pot in the Hollows of trees.