News by Levels · Level 2 · Student worksheet

Teeth Reveal Clues About a Giant Rodent

In this lesson: Connect several estimation methods with a limited fossil sample.

Name: __________________________ Date: __________________

Read the story

Fossil teeth from Thailand belong to Yakamys sirindhornae, a rodent from about 34 million years ago. Researchers used seven methods to estimate its body mass.

Their estimate is around 30 kilograms, about twice the size of other known rodents from that era. Limited fossils leave uncertainty.

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. How did researchers estimate body mass?

   1. Using seven methods
   2. Weighing a living animal
   3. Measuring a complete skeleton

2. What is the comparison with other known rodents from that era?

   1. About the same size
   2. Exactly ten times their size
   3. About twice their size

Your turn

Explain the estimate and why it still needs qualification.

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Read online: https://newsbylevels.com/news/thailand-yakamys-giant-rodent-fossils-november-2026/level-2/