Ancient Platypus Had Teeth 25 Million Years Ago

Scientists just discovered that the platypus, already one of nature's oddest creations, was even stranger 25 million years ago when it still had a full set of crushing teeth.

Researchers at Flinders University unearthed fossils of an ancient species called Obdurodon insignis at a site in South Australia where they've been digging for 20 years. The fossils include teeth and a rare shoulder bone that together paint a picture of an animal that looked remarkably like today's platypus but lived very differently.

The most exciting find is a molar tooth about 25 percent larger than previously known specimens. Its ridges and robust structure reveal an animal built to crunch through armored prey like freshwater crayfish, something modern platypuses can't do with their soft grinding pads.

"The new premolar for Obdurodon insignis shows this species also had large, pointed front teeth, which, with its large, robust molar teeth, could easily have crushed animals with shells or robust exoskeletons like yabbies," said study co-author Trevor Worthy from the Flinders Paleontology Lab.

The shoulder bone tells an equally fascinating story. It's only the second body fossil ever found for this species, and it shows that ancient platypuses were already skilled swimmers 25 million years ago, moving through water with a familiar horizontal stroke.

However, the shoulder joint was slightly more flexible than in modern platypuses, suggesting these ancient animals may have been less specialized swimmers. They were competent in the water but hadn't yet perfected the efficient, tightly controlled swimming motion we see today.

Why This Inspires

This discovery matters because it shows evolution doesn't always move in a straight line toward perfection. The ancient platypus was thriving with teeth while the modern version succeeded by losing them entirely.

Platypus fossils are incredibly rare, making each new find a precious window into how these egg-laying mammals evolved over millions of years. The fact that researchers can piece together an animal's entire lifestyle from just a few teeth and a shoulder fragment shows the power of careful scientific work.

"Platypuses are extremely rare in the fossil record and are often restricted to teeth, so it's exciting to find new material and learn more about these unique mammals," said co-author Dr. Aaron Camens.

The platypus has been puzzling scientists since Europeans first encountered it, and 25 million years later, it's still revealing surprises that help us understand how life adapts and thrives in unexpected ways.