How taste blossoms are?

( nikon d70 ;white eye,"Mejiro")
What does a wild birdie do everyday after all? whenever I see " white eyes", they flock to blossoms or fruits everyday everywhere.
People use the proverb" Same feather flock together."How can birdies recognize as a member of same group each other? I have no idea about it at all.
By the way ,In Germany, "Geschlecht" means both gender and race sometime generation or house.
That is to say, To recognize something as a same member and to make couple within the same group are equal each other.
In Japan , everyday, personificated explanations are applied to the animal behavior by the TV program. Are zoologist fairy writers? I often doubt they are not scientists.