Herbivores feeding on their own

Can herbivores feed on their own now? Because i put a lone stegossaurus on the new isla sorna sandbox mode and forgot to place a feeder, returned to him later and his food metter was around 50%, i went away and forgot about the feeder AGAIN but when i returned for the second time his food metter had gone up to 90 something %. There were no herbivore feeders on the map at all, only bushes, trees and water? How did he survive??
 
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