Meet the 'Hell Chicken': The First Fruit-Eating Dinosaur?

When you picture the world of Tyrannosaurus rex, you probably imagine giant teeth, crushed bones and herbivores chewing on ferns. You do not imagine a feathered dinosaur happily munching on fruit. But a newly named species, nicknamed the "hell chicken", may change that picture.

Palaeontologists from Stony Brook University in New York, the Royal Ontario Museum (ROM) in Toronto and the North Dakota Geological Survey have described a dinosaur called Infernogallus jamesi. In a study published in the journal Nature Communications on 10 October 2026, and announced by the museum and university in late October, the team argues it is the first known dinosaur that specifically ate fruit.

Who was the "hell chicken"?

Infernogallus lived about 66 million years ago, at the very end of the age of dinosaurs. Its neighbours included T. rex and Triceratops. The name sounds scary, but it has nothing to do with its temper. "Hell" comes from the Hell Creek Formation, a famous fossil-rich rock layer that stretches across Montana, North Dakota, South Dakota and Wyoming in the United States. According to CBC Radio, the fossil was discovered there in 2011.

It was small for a dinosaur. Researchers say it was about the size of a turkey and weighed around 12 kg as a fully grown adult, making it one of the smallest members of its family.

That family is called the caenagnathids: toothless, feathered, bird-like dinosaurs with beaks. Lead author Dr Gregory Funston of Stony Brook University described it to CBC as something like a cross between an emu and a parrot, and joked that it was probably quite vicious in personality.

Why this fossil is so special

Caenagnathids have puzzled scientists for more than a century. Most of what we knew came from scraps: a jaw here, a hand there, a foot somewhere else. Nobody knew what their full skulls looked like.

The hell chicken changes that. The fossils include a nearly complete, articulated skull and a partial skeleton, now on display at the ROM. The Nature Communications paper calls it the first such skull for the whole group.

"For more than 100 years, we didn't know what the skulls of these animals looked like. Now, we know they were even weirder than we could have predicted," Funston said in the ROM press release.

A dinosaur that chewed like you

Here is the most surprising part. Most dinosaurs had jaws that closed straight up and down, like a pair of scissors. That works well for tearing meat or slicing leaves.

Using CT scans to rebuild the skull digitally, the team found that the bones forming the roof of the mouth arched downwards. This turned some of the jaw muscles so they pulled front-to-back instead of up-and-down. The result: the beak could slide back and forth while chewing, a bit like the way humans grind food.

This muscle arrangement is rare in nature. According to the researchers, it shows up in mammals with complex chewing, like us, and in some fruit-eating birds such as the Vulturine Parrot (also called the Dracula Parrot). The paper says this exact setup is unique among non-bird dinosaurs but matches that of modern fruit-eating parrots.

Funston told CBC that the animal was chewing something soft that needed a lot of processing before swallowing, and that, to the team, "there's sort of only one thing that fits and that's fruit." The ROM release adds that the skull seems specialised for mashing stone fruits to strip the flesh off the seed.

Why fruit-eating dinosaurs matter

Flowering plants began spreading on Earth around 130 million years ago, according to CBC, slowly replacing cone-bearing plants and filling forests with fruit. Birds, which are themselves living dinosaurs, have been eating fruit for at least 120 million years.

But scientists struggled to find any clear link between non-bird dinosaurs and this huge change in plant life. If the hell chicken really ate fruit, it suggests these dinosaurs may have helped spread seeds, the same job that birds, reptiles and small mammals do today. The team also says caenagnathids developed their special chewing ability as fruits became bigger and more common.

There is another twist. Caenagnathids evolved from the meat-eating branch of the dinosaur family tree, the same broad group as T. rex. So a distant cousin of the most famous predator ever may have turned into a fruit lover.

Not everyone is convinced

Good science comes with healthy debate, and this claim has its critics.

Science writer Riley Black, who was not part of the study, told CBC she was thrilled by the fossil but called the fruit evidence "for the moment, circumstantial." To prove it, scientists would ideally need fossilised gut contents showing fruit inside the animal, which are extremely rare.

Palaeontologist Nick Longrich of the University of Bath went further in a blog post on 14 October 2026, titled "Were Caenagnathid Theropods Fruit-Eaters? Probably not." His main points:

• Most fruit-eaters today are small, while many caenagnathids were big, and some were enormous.
• Most fruit-eaters live in trees or can fly. Caenagnathids lived on the ground.
• Many caenagnathids lived in cold, seasonal places dominated by conifers, where fruit would not be available all year.
• The skull, he argues, looks more like that of plant-eaters such as tortoises than fruit-eating parrots.

Longrich does not say it is impossible. He argues that stronger proof, such as large fossil fruits from the same rocks or gut contents, is needed.

The bottom line

Either way, the hell chicken is a remarkable find. It gives us our first proper look at the head of a mysterious dinosaur group, and it shows that the world of T. rex was far more varied than we thought. As ROM senior curator Dr David Evans put it in the release, the discovery "shows that we still have a lot to learn about the world of T. rex."

Was it a fruit specialist or a general plant-eater? The answer may be waiting in the next fossil to come out of the ground.