Final answer:
Herms in Greece had animal heads and were associated with Hermes, the god of travel; they stood at crossroads as markers and protectors for travelers.
Step-by-step explanation:
According to Crash Course Mythology, the square pillars called 'herms', which were put at crossroads in Greece, had animal heads. These were typically associated with the god Hermes. Hermes was considered the god of travel, commerce, and communication, among other things, and herms served both as road markers and as a form of protection for travelers. The placement of these herms at crossroads was significant as crossroads themselves carry symbolic weight, representing choice, change, and the meeting of different paths, which aligns well with the roles Hermes played in Greek mythology.