From the traditional concept of good or ill luck, blackbirds, as auspicious things among birds, flying home means that there will be good news at home, especially good news related to wealth and marriage. Some people will regard the flying of blackbirds into the house as a good omen and think that good luck will come. There are also some people who think that blackbirds flying into their homes is an ominous omen, because blackbirds usually stay in unlucky places such as cemeteries and garbage dumps, and their arrival may mean something unknown happens at home or the death of their loved ones.
However, in modern society, we should treat this phenomenon rationally. It may be just a coincidence that blackbirds fly into their homes, so don't over-interpret or deify them. If you want to raise snakehead, you can follow the relevant guidelines for bird breeding. If you choose to release them, you should also follow the laws of nature and not destroy the ecological environment.