What is the name of a black and white bird in Nanjing?

It should be a magpie robin (Copsychus Saularis)

There are two subspecies, and South China subspecies is common in China.

Classification: birds, passeriformes, thrushes.

Habitat: Orchards, vegetable fields, shrubs and sparse forests near villages.

Predation: pecking at food with the mouth.

Food: All kinds of insects like to eat maggots, locusts and termites. Used in agriculture, forestry and birds.

Size: 20 cm long. It weighs 30 ~ 40 grams.

Also known as "four happy birds": "One is happy with a tail like a fan, one is singing a romantic song happily, the third is more beautiful, and the fourth is happy." This is a kind word for the "Sixi" bird. Locked in a cage, enjoying leisurely. Although the spirit of this long-tailed "Four Happiness" bird lacks the elegance of natural "Four Happiness", its heart is still full of sweet hopes and temptations. Four blessings are coming, and people yearn for it.