Day 6: Other related deities and entities associated with this deity.“Outside the cave [of his mother Maia] he [the infant god Hermes] found a tortoise feeding. He cleaned it out, and stretched across the shell strings made from the cattle he had sacrificed, and when he had thus devised a lyre he also invented a plectrum” (Pseudo-Apollodorus, Bibliotheca 3.)
6. The youngest, bratty brother of twelve Olympians, Hermes is related to all the other through their Father Zeus. His reputation amongst the Gods was great, as He was known even to them all as one of great knowledge and communication. When Egyptian religion was integrated into the Hellenic world, a few different Netjer were merged with Him to create knew combinations of Hermes. The similarities between ibis-headed Thoth (Tahuti), the great librarian and scholar of memories in Kehmet, with Hermes (later as Romanized Mercury), invading nations synchronized not necessarily in order to eradicate but to strengthen their own spiritual pursuits. During the Roman period, the chthonic qualities of Hermes were merged together with that of the Egyptian Anubis (God of the afterlife and guide for the Dead), upgrading Him to Hermanubis...patron of the Egyptian priesthood.
Whilst not an “entity”, the Herm (or the Hermai) were boundary markers representing the good God. Usually depicted as a large standing, square pillar with a head on top and phallus, the Herm were shrines to encourage fertility of land and herds. The Herm was also a place to ensure good luck, such as a crossroads for travelers or the gymnasium, as sports and gambling both are favourites of Lord Hermes.
As it seems with all deities, there are specific animals and plants which are especially favoured and considered sacred to Hermes. Based on folklore, and perhaps some ancient UPG, one animal was the Hare; a creature of great fertility and very, very quick, the one Hermes Himself placed into the night sky. Ironically, the tortoise is also associated with Hermes as He found one and fashioned the world's first lyre. The Ram is also often seen in the icon of Hermes, as shepherd and king of flocks.
During a dangerous game of discus, Hermes accidentally killed His buddy Krokus; when three blood drops fell on the ground, flowers sprang in their stead...and hence everafter named the Crocus. Aside from the generic olive trees sacred to most of Zeus' children, there does not seem to be much flora associated with Him classically. The lore does mention Him being fed from a strawberry tree (andrakhnos) as a baby, the bizarre, tasteless fruit of Arbutus unedo.