The platypus is an Australian mammal that is not easily classified. It is one of only two mammals (the other being the echidna) that bears young by laying eggs. In some respects, the platypus resembles a duck; both have webbed feet and bills. The platypus has a tail like a beaver’s and a furry body similar to an otter’s. Its unusual hybrid of body parts makes it well-suited for its largely aquatic life. The platypus uses its webbed feet to paddle through the water, and its tail serves as a kind of rudder for steering. While underwater, the platypus uses its bill to scoop up bits of food, such as insects and shellfish, from the water’s bottom. The platypus also scoops up bits of gravel, which grinds up the food, as the platypus is toothless. The platypus stores the food and gravel in its cheeks until it reaches the water’s surface. Once the platypus surfaces, it consumes its meal. Which sentence describes the main idea?

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The platypus has features similar to an otter and a beaver.
The platypus has features similar to an otter and a beaver.

The platypus uses an interesting method to consume its meals.
The platypus uses an interesting method to consume its meals.

The platypus lives in Australia.
The platypus lives in Australia.

The platypus is a mammal with many characteristics that make it unique.
The platypus is a mammal with many characteristics that make it unique.