* Capybara: The world's largest rodent, it's a semi-aquatic mammal with a reddish-brown coat and a large, rat-like head. However, they are much larger and have a distinctive round body.
* Paca: This rodent is smaller than a capybara but still larger than a typical rat. It has a stout body, short legs, and a large head.
* Marmot: This burrowing rodent is found in mountainous regions and can be quite large. They have a stocky build and a long, bushy tail.
* Beaver: While not strictly resembling a rat, their size and semi-aquatic lifestyle can lead to confusion. Their flat tails and large, gnawing teeth are distinct features.
* Muskrat: These semi-aquatic rodents have a rat-like appearance but are typically darker in color and have a long, scaly tail.
Remember, while these animals share some similarities with rats, they have their own unique characteristics and are quite different from their smaller rodent cousins.