Do really  relatives visit our house when Crow shrieks ?.

Yes .   Why ?

In the olden days, when there were no any kind of transport  facilities, communication, and any other techonoly, Birds were so useful  to  the  mankind for sending the messages, news  e tc., from one place to another place. They used to depend on the Birds and think they are like messengers.Normally those days in India most of the people live only in the villages.They used to send their news, messages by the Birds.  By nature birds and pet animals live whereever the people live. Crows also  live there only in  the  trees. If any new specie of Bird or Birds from new place  come to that village, the Crows start scream at a time. This means people can understand some new Birds entered the village and immediately they could guess that theie relatives sent some news by Birds from other places .And also think that their relatives are going to visit their house. So now we can understand the inner meaning of Crow’s screaming.

More over when a crow falls and dies before us, those days people never used to take food. immediately. For some hours  they did not use to take their food. It was the custom observed by the people. If they eat immediatley , they used to  feel it would be a bad thing.