Back to latest news

Teeth Reveal Clues About a Giant Rodent

Several methods produced an approximate body mass.

Your learning

Loading your learning…

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

Beginner support · Translation help

Read with help in your language

Choose a language to see each paragraph translated below the English. Tap highlighted words for a quick meaning.

from to , a from 34 . to its .

Their is 30 , the of from that . .

Source: McGill University, 2026-11-10.

Read · Think · Practise

Try this story

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

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

Print a worksheet · Teacher guide & answers

Read and understand · 1/2How did researchers estimate body mass?

Read the answer and explanation

Using seven methods. The first paragraph explicitly says seven methods estimated its body mass.

Clue: 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.

Read and understand · 2/2What is the comparison with other known rodents from that era?

Read the answer and explanation

About twice their size. The second paragraph gives the approximately twofold comparison.

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

Grammar in this story: Evidence limits certainty

Limited fossils leave uncertainty

Limited describes the small amount of fossil evidence; uncertainty remains even when several estimation methods are used.

Your turn

Explain the estimate and why it still needs qualification.

See one possible answer

Seven methods produced an estimate of around 30 kilograms, about twice the size of other known rodents from that era. The fossils are limited, so the figure remains uncertain.

Your answer can be different. Give a reason and use your own words.

0 of 2 questions checked.

Tell us what helped or felt difficult

Which reading level did you try? Was a sentence unclear? Did the questions help you understand the story?

Send feedback by email

Your three-minute English break

A little English in your inbox.

One short story, one useful phrase, one quick question. Free, up to twice a week.