This creature can move through forest provinces without any penalty and is less likely to starve when the army runs out of supplies in these provinces. Underground, units with this ability can traverse cave forests without movement penalty.
Forest survival reduces the map move cost of entering and leaving forest terrain by 2. Units with Forest Survival contribute to supply usage as usual when an army is in a Forest province, but will not be among those given the starving trait if the army begins starving due to lack of supplies.