The most accurate answer is a turtle since tortoises are a type of turtle. More specifically, tortoises are land-dwelling turtles with certain distinctive characteristics.
Here's a more detailed breakdown:
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Turtles (Order Chelonia): This is the broad category encompassing all turtles, tortoises, and terrapins. They all share the common trait of having a shell.
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Tortoises: Tortoises are a specific kind of turtle. They are exclusively land-dwelling and generally have a heavier, domed shell and stumpy, elephantine feet suited for walking on land.
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Terrapins: Terrapins are another type of turtle that lives in brackish water (a mix of salt and fresh water).
Therefore, while a terrapin is also a possibility, it isn't as close as a turtle, which is a group that contains the tortoise. Since tortoises are a subset of turtles, any tortoise is also a turtle.
Essentially, asking what animal looks like a tortoise is similar to asking "What kind of dog looks like a Labrador?". The answer is "Another dog", just like another turtle looks like a tortoise.