Back to today’s briefing

Story perspectives

74-Million-Year-Old Fossil Reveals Tiny Mammal's Secrets

8/13/2025

48 5

Summary

Story summary

A remarkable discovery in Chilean Patagonia has unveiled a 74-million-year-old fossil of Yeutherium pressor, the smallest mammal from South America’s Upper Cretaceous period, weighing just 30-40 grams. This tiny creature likely laid eggs or nurtured its young in a pouch, feeding on tough vegetation, offering a fascinating glimpse into prehistoric life.

1 of 1

Story summary

A remarkable discovery in Chilean Patagonia has unveiled a 74-million-year-old fossil of Yeutherium pressor, the smallest mammal from South America’s Upper Cretaceous period, weighing just 30-40 grams. This tiny creature likely laid eggs or nurtured its young in a pouch, feeding on tough vegetation, offering a fascinating glimpse into prehistoric life.