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Spider-Man and Green Goblin go back a long way. However, Trilobites are a good source of chitin and provide some oil and pearls as well. Trilobites are no threat to anyone, provide little food, and have no use being tamed. This oddity mostly sticks to the oceans and some rivers but will occasionally venture onto the beaches. Trilobite - The Trilobite is a strange mix between a slug and a crab. However, taming a Plesiosaur presents a rather large challenge since these creatures do not like to surface and do not stray far from the ocean floor.
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Because of their massive size tribes can build small mobile bases on their back. In the wild these creatures are not particularly quick but when tamed can be almost as fast as wild Ichthies. One of the more powerful creatures in the sea it can easily take on Megalodons that are feeling lucky. Plesiosaur - The Plesie is a massive deep sea creature that never really strays far from home. This provides the perfect opportunity to have mobile sea base or a heavily armed warship of sorts. If a tribe is eager enough to tame such a large beast they can chose to place a platform saddle on its back. While not the fastest creature in the sea, it definitely is the most powerful. Although it spends most of its time near the bottom, the Mosa actually breathes air, only coming up to eat or breathe. This massive beast is likely the largest creature in the ocean. Mosasaurus - If the Megalodon is the T-Rex of the sea, then the Mosasaurus is the Giganotosaurus.
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It is always best to check the water first before going for extended swimming sessions. While not a big threat alone or smaller groups, they will ruin anyone's day when swimming in large schools. If you find water inside one of the many caves on the island there is an excellent chance you'll find a large pack of them swarming anything that falls in. Just as the Megalodon rules the seas, the Mega Piranha rules the lakes and rivers of the island. Mega Piranha - This aggressive carnivore hunts in packs ranging from a few to 20 or more. With the right saddle a Megalodon is a good choice for a moderate sea mount. It is highly recommended that you bring a metal Pike with you when swimming in the oceans as this will be your best defense against them, if you must defend yourself. Powerful and fast, this predator is extremely aggressive and will attack nearly everything in the water, including other Megalodons. This sea creature is basically a swimming version of a T-Rex. While it may look like a Great White shark it is several times larger. Megalodon - One of the deadliest creatures you will encounter under the waves.