I think benito is right.
German wikipedia:
"In der griechischen Mythologie war der Kranich sowohl Apollon, dem Gott der Sonne und Demeter, der Erd- und Fruchtbarkeitsgöttin, als auch
Hermes als Bote
des Frühlings und
des Lichts zugeordnet. So lasen die Auguren (Priester) in Griechenland aus den Flugformationen der Kraniche. Außerdem galten Kraniche als Symbol der Wachsamkeit und Klugheit."
In
Greek mythology the crane was assigned to
Apollo the god of the sun, Demeter the earth and
fertility goddess and
Hermes as the messenger of
spring and the light. The augurs (priests) in
Greece read the flight formations of the cranes. In addition, cranes were seen as a symbol of vigilance and prudence.
I've searched for Heron in
mythology and I have ony found that heron was a messanger in Odyssey. So drane seems to me more likely.
Hera and
peacock would make sence but it would be probably the only
type with
Hera from Odessus and the only
type with
Hera holding grain ears.
Peacock is always depicted as elegant bird not with "bedraggled feather" like bird on this coin. It seemed strange to me if they decide to depict
Hera and
peacock this way.
I attach photo of Crane.
Jan