A carrier pigeon in flight form can withstand 10-12 hours at a speed between 60 and 80 km / h and if the wind blows in front of birds flying at low height if knocking back flying at great height.
Regardless of flight direction home, west winds help pigeon while the east make it difficult navigation, so if summer when the temperature is high and the wind does not blow at all, you should not launch the birds, there is a high probability to lose.
White doves are looking for pairs of grooms at their weddings because it is said to bring happiness and prosperity to the couple.