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Unlike gobies , rice fish always stay in the water , suggesting that the vine snakes were catching their meals directly from the river . On removing the snails from the tablet and placing them in tepid water , one of them came out of its shell . It is a carnivore that was introduced to Madagascar to control the devastation caused by the introduced Giant African Snail , Achatina fulica . All business , Bandar identifies it as a male harbor seal , measures its body size , looks for signs of trauma , and then checks to see if its head is reasonably intact .