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| Habitat | Totally aquatic. dwell in extremely vast saltwater bodies, like seas and oceans. | Semi-aquatic animals. Inhabit tiny, freshwater or “brackish” bodies of water including ponds, rivers, and marshes. | Creatures that live on land. They are unable to swim and will die if forced into the water above their heads. |
| Food habit | Omnivorous. Consume both plant materials and animal protein in their diet. | Same as turtles. Omnivorous. | strictly herbivorous. They need a lot of greenery every day to sustain and build their bodies. |
| Shell | Mostly possess shells that are flat and oval. | The shells are spherical and somewhat flattened. | The shells are rounded, tall, and thick. |
| Limb | There are no feet. Rather, they possess flippers that assist them through the water. | Possess short, stocky legs, somewhat flattened, and webbed toes. Toes are all equipped with sharp claws. | Have strong, powerful legs that protrude from their torso at an angle. |
| Lifespan | Mostly may be expected to survive for 70–80 years in the wild. | The average lifespan is only a few decades. | Their median age is 80, and can live to be over 100! |
