The main genera and families of Corvidae.
There are 29 species of Carniidae 13 genera in China. The feather color of Cissa is mainly green, while that of Urocissa is mainly blue or black and white. The green magpie is naked, hairless around the eyes, and has obvious small sarcoma of orange or scarlet, while the blue magpie does not have the above characteristics; The tail length of green magpie is almost the same as its wings, or slightly longer than its wings, while the tail length of green magpie is longer than its wings, even longer than its wings. Tree magpie (Dendrocitta, Temnurus, Crypsirina) has normal tail feathers, the same width at the base and the end, and the body feathers are brownish white. Although the body color of Magpie is similar to that of the previous genus, the ends of a pair of tail feathers in the middle suddenly expand; Magpie is black with forked tail feathers. Magpie (pica), blue magpie, Perisoreus, Garrulus and Dendrocitta are closely related, among which Pica is primitive. Podophyllum and pseudopodophyllum are another branch; Nucifraga is an independent branch, and Corvus is the most successful branch in evolution.