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Thai Fossils Broaden the History of Giant Rodents

An estimate and an evolutionary interpretation have limits.

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Science news editorial illustration for Fossil Teeth Point to a Giant Rodent in Ancient Thailand

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10 from . a of 30 , but .

The in the of . More are to the and .

Source: McGill University, 2026-11-10.

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Try 2 questions about this story, then explain one idea in your own words. Check the text whenever you need to.

In this lesson: Separate dental measurements, an inferred body mass and an evolutionary interpretation.

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Read and understand · 1/2What supports the estimated body mass?

Read the answer and explanation

Dental measurements. The first paragraph links dental measurements to the approximate mass.

Clue: McGill’s November 10 report describes Yakamys sirindhornae teeth from Thailand. Dental measurements suggest a body mass of approximately 30 kilograms, but substantial uncertainty remains.

Read and understand · 2/2What would more fossils help explain?

Read the answer and explanation

The animal’s biology and history. The final sentence names biology and history as questions requiring more fossils.

Clue: The discovery suggests Southeast Asia also mattered in the early evolution of large rodents. More fossils are needed to explain the animal’s biology and history.

Grammar in this story: A cautious inference

suggest a body mass

Suggest marks an inference from the measurements, with substantial uncertainty explicitly retained.

Your turn

State the discovery’s evolutionary implication and its limit.

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The discovery suggests Southeast Asia mattered in the early evolution of large rodents. However, substantial uncertainty remains in the body-mass estimate, and more fossils are needed to explain the animal’s biology and history.

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