It could be Daphnia rubra. Or feed egg yolk water for a few days first, and then feed chopped nematodes. ?
If you are in the countryside, you can catch grasshoppers and feed them in the mountains and fields. If you are in the city, it is not easy to find them. You can go to the flower and bird market or pet market to buy bugs (specially for feeding birds). ?
Birds like eating insects best. As long as they are not hard-shelled, cut them into small pieces and feed them. You can also try feeding millet and vegetable leaves.
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Swallow: It is the general name of 74 species of passerine birds. Small size, narrow wing tip, short beak and concave tail, weak feet and few feathers. Feathers are monochromatic, or blue or green with metallic luster; Most men and women are very similar.
Swallows spend a lot of time catching pests in the air. It is one of the most flexible birds, mainly feeding on mosquitoes, flies and other insects, and it is a well-known beneficial bird. Nesting in tree holes or cracks, drilling holes in sand dikes, or sticking mud on walls or protrusions of corridors, roofs, eaves, etc. In urban and rural areas. 3 pounds per work? Seven eggs.
Swallow's hometown is in the north, which is mysterious, so it was called the mysterious bird in ancient times. The Chinese character "Yan" refers to the domestic swallow. Swallow's front waist is chestnut red, its back chest has irregular horizontal stripes and its abdomen is milky white. Swallows usually breed from April to July. Domestic swallows nest under the eaves of farmhouses. Food is insects. Yan is a typical migratory bird. After the breeding, the young birds still follow the adult activities, and gradually integrate into large groups, and move south for the winter before the first cold wave comes.