News by Levels · Level 3 · Student worksheet

Thai Fossils Broaden the History of Giant Rodents

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

Name: __________________________ Date: __________________

Read the story

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.

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.

Source: McGill University, 2026-11-10. https://www.mcgill.ca/newsroom/channels/news/giant-prehistoric-rodent-fossils-discovered-southern-thailand-375555

Read and practise

1. What supports the estimated body mass?

   1. Direct weighing of a living Yakamys
   2. A complete record of its biology
   3. Dental measurements

2. What would more fossils help explain?

   1. The exact date of McGill’s report
   2. The animal’s biology and history
   3. A confirmed living population

Your turn

State the discovery’s evolutionary implication and its limit.

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Read online: https://newsbylevels.com/news/thailand-yakamys-giant-rodent-fossils-november-2026/level-3/