WHY ARE SOME BEES REFUSED ENTRY INTO THE HIVE?

Bees entering a behive (greeb in color); some bees are refused entry because they are drunk with fermented nectar.
Beehive entrance
Bee collecting nectar from plant with white flowers. Afterwards the be has to go back to the beehive and perform a complex dance to be allowed in.
Bee collecting nectar

All nests have guard bees that check individual bees to ensure they are members of the colony before they are allowed entry into the hive. Moreover, bees communicate by performing a complicated dance. When field bees feed on fermented nectar, guard bees refuse them entry because they get drunk and fail to "speak" the right language. Fermented nectar may cause bees to crash into stationary objects, fall to the ground or lose direction.

A bee on a flower. The bee has white pollen all over its body. Even when a bee is full of pollen, it must "speak" the right language gain entry into the hive.
A bee full of pollen
Behive made of wood. Entry is a gap between two pieces of wood. Guard bees check individual bees to ensure they are members of the colony before they are allowed entry into the hive.
Bees guarding entry of beehive

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