Achatina's are by far the hardest animals to escape on the island. Their insane movement speed is devastating to you and your dinos. These snails are also very powerful and will kill your gigas within, at least, 24 hours! The best thing to do when you see them is bola them and run.
These fantastic creatures collect honey and sap, craft a mortar and pestle , make some stimulants when wild, after that they craft a cooking pot and grab a waterskin, fill it up and bake their delicious cake. This is how these creatures survive in wild life. They also grind alot of metal to get enough sap tap that will be enough to keep them from starving to die. Some snail elders have shared the cake recipe with humans to be tamed.