The world's 'heaviest animal in history' has been knocked off her throne
She's not that heavy, just big boned.

Perucetus Colossus
Last year, scientists in Peru announced they had discovered the world’s heaviest animal. Dubbed Perucetus Colossus or P. Colossus, for short, this ancient whale with a bloated body, small head and small fins, was estimated to tip the scales at a resounding 700,000 pounds. That’s larger than the largest animal up to that point—the Blue Whale—which can weigh up to 540,000 pounds.
The unusual fossils of P. Colossus believed to be nearly 40 million years old, were discovered in a desert in Peru. Whereas bones are normally spongy-looking, these fossils appeared dense and inflated, leading scientists to debate whether these were bones or rocks. It was determined they were, in fact, bones—vertebra bones, to be exact, each of which weighed at least 220 pounds. They also found ribs measuring nearly five feet across. All told, they found 13 vertebrae, four ribs, and part of a hip.
Using projections, it was estimated that this was the heaviest animal ever to have lived.
Headlines abounded, mentioning the size of this silly-looking beast.

Projected skeletal image of Perucetus Colossus
Ivan Iofrida/ WIKIMEDIA COMMONS
However, in late February 2024, scientists changed their tune. It turns out the estimates were off, and this chonky gal was merely big-boned, literally.
The new estimates put P. Colossus at 60 to 70 tons at 17 meters long and 98 to 114 tons at 20 meters long. It is still quite heavy, maxing out at 228,000 pounds, but not nearly as heavy as the blue whale, which maxes out at approximately 540,000 pounds or 270 tons.

P. Colossus as compared to a blue whale and a human
Cullen Townsend/Cullen Townsend (used with permission)
So what happened? Here’s some sciency language from the new study, “Downsizing a heavyweight: factors and methods that revise weight estimates of the giant fossil whale Perucetus Colossus."
“[The scientists who said P. Colossus was the heaviest animal] based their estimates on a new method, in which they first estimated the total skeletal mass of Perucetus through extrapolation from the skeletal material and then used the value to secondarily extrapolate its body mass, assuming skeletal to body mass ratios based on extant cetaceans and sirenians. A simple ratio mandates an isometric relationship between body and skeletal masses, and they justified this step by testing for isometry using a phylogenetically controlled regression.”
Ah yes, how many times a phylogenetically controlled regression has come around to bite us on the butt.
Translation: It’s understandable, sort of, why they used the wrong equation, but make no mistake—they used the wrong equation. And now, some science shade from the same paper:
“Their method involves questionable assumptions that suggest their body mass estimates are not reasonable…”
“It is important to note that the overall size estimate of Perucetus has remained the same,” Cullen Townsend told Upworthy. Townsend is an artist who renders prehistoric animals for the Natural History Museum Los Angeles, among others, and who created a corrected rendering to accompany the new paper.
Says Townsend: “What is now being debated is how heavy the animal potentially was. Our understanding of prehistoric animals is filled with holes and can change drastically with a new discovery or research. It is not surprising that scientists are coming to new conclusions. Our depictions of nearly every prehistoric animal have changed over time to better correspond with advancements in paleontology and our interpretation of the fossil record. Our current understanding of Perucetus is no different and will likely change again in the not-too-distant future. It is the nature of this field.”
So no "Real Scientists" reality show coming to cable TV anytime soon?
Or "Biggest Loser, Animal Style"? (P. Colossus wins, obviously)
The NatureWasMetal Reddit group saw this coming:
“Of course, Perucetus was going to be downsized… I’m never going to trust this sort of claim again, I felt like it couldn’t be true,” said Kaam00s.
“All my hopes and dreams shattered… I lived for that chonky whale man,” said Grouper3.
But Time-Accident3809 pointed out the silver lining:
“We are so lucky to coexist with the largest known animal to have ever lived. Now here’s hoping we don’t [mess] that up as well.”
- 'Whale nerd' zoologist says 'mind completely blown' filming 1,000 fin whales in one spot ›
- What everyone heartbroken over the 'Planet Earth II' turtle episode should know. ›
- Los Angeles is opening the world’s largest wildlife bridge that crosses over a busy freeway ›
- Help for a desperate mom who couldn't find size 23 shoes for her teenage son - Upworthy ›
- Musician shares how he taught an octopus to play the piano - Upworthy ›



A Generation Jones teenager poses in her room.Image via Wikmedia Commons
An office kitchen.via
An angry man eating spaghetti.via 



An Irish woman went to the doctor for a routine eye exam. She left with bright neon green eyes.
It's not easy seeing green.
Did she get superpowers?
Going to the eye doctor can be a hassle and a pain. It's not just the routine issues and inconveniences that come along when making a doctor appointment, but sometimes the various devices being used to check your eyes' health feel invasive and uncomfortable. But at least at the end of the appointment, most of us don't look like we're turning into The Incredible Hulk. That wasn't the case for one Irish woman.
Photographer Margerita B. Wargola was just going in for a routine eye exam at the hospital but ended up leaving with her eyes a shocking, bright neon green.
At the doctor's office, the nurse practitioner was prepping Wargola for a test with a machine that Wargola had experienced before. Before the test started, Wargola presumed the nurse had dropped some saline into her eyes, as they were feeling dry. After she blinked, everything went yellow.
Wargola and the nurse initially panicked. Neither knew what was going on as Wargola suddenly had yellow vision and radioactive-looking green eyes. After the initial shock, both realized the issue: the nurse forgot to ask Wargola to remove her contact lenses before putting contrast drops in her eyes for the exam. Wargola and the nurse quickly removed the lenses from her eyes and washed them thoroughly with saline. Fortunately, Wargola's eyes were unharmed. Unfortunately, her contacts were permanently stained and she didn't bring a spare pair.
- YouTube youtube.com
Since she has poor vision, Wargola was forced to drive herself home after the eye exam wearing the neon-green contact lenses that make her look like a member of the Green Lantern Corps. She couldn't help but laugh at her predicament and recorded a video explaining it all on social media. Since then, her video has sparked a couple Reddit threads and collected a bunch of comments on Instagram:
“But the REAL question is: do you now have X-Ray vision?”
“You can just say you're a superhero.”
“I would make a few stops on the way home just to freak some people out!”
“I would have lived it up! Grab a coffee, do grocery shopping, walk around a shopping center.”
“This one would pair well with that girl who ate something with turmeric with her invisalign on and walked around Paris smiling at people with seemingly BRIGHT YELLOW TEETH.”
“I would save those for fancy special occasions! WOW!”
“Every time I'd stop I'd turn slowly and stare at the person in the car next to me.”
“Keep them. Tell people what to do. They’ll do your bidding.”
In a follow-up Instagram video, Wargola showed her followers that she was safe at home with normal eyes, showing that the damaged contact lenses were so stained that they turned the saline solution in her contacts case into a bright Gatorade yellow. She wasn't mad at the nurse and, in fact, plans on keeping the lenses to wear on St. Patrick's Day or some other special occasion.
While no harm was done and a good laugh was had, it's still best for doctors, nurses, and patients alike to double-check and ask or tell if contact lenses are being worn before each eye test. If not, there might be more than ultra-green eyes to worry about.