All articles tagged with #theropods
Birds are a living branch of theropod dinosaurs that survived the asteroid impact, with four lineages giving rise to 11,131 species, a count now unified by AviList; the article emphasizes that birds are inside the dinosaur group, not descended from them and later outside it, and discusses how forest collapse after the extinction event helped some lineages endure.
A new analysis of 82 theropod species links forelimb shrinkage to the rise of giant sauropods, suggesting evolutionary pressure favored larger jaws for prey while arms became vestigial. In tyrannosaurids, all forelimb elements reduced at similar rates, implying skull strength preceded arm loss and that grasping was no longer essential for predation. The study shows correlation rather than causation, but supports the shift from using arms to rely on jaws for hunting.
A new study of 82 theropods, including T. rex, finds reduced forelimbs evolved independently in five groups as heavily built skulls and strong bites became the primary hunting tool; skull robustness appears to drive forelimb shrinkage, with giant prey pushing predators toward jaw-based attacks and different lineages shortening arms via separate evolutionary paths (not merely due to overall body size).
New research argues Tyrannosaurus and related theropods reduced forelimb size as they evolved larger, more robust skulls and jaws, using jaws as the primary weapon against enormous prey. An analysis of 61 theropods shows a strong link between short arms and robust skulls across five families, with skull growth likely preceding arm reduction. Forelimbs retained some function but did not drive the arms’ evolution; the study emphasizes correlation, not direct causation, and was published in Proceedings of the Royal Society B.
A new study of 82 theropod species finds that giant predators didn’t shrink their arms because their bodies grew larger; instead, as jaws and skulls became more powerful, forelimbs became less necessary and were reduced in five independent lineages. The researchers linked arm length to skull robustness, showing a stronger correlation with powerful jaws than with body size. Skull development preceded arm reduction, meaning the bite-based hunting strategy replaced grasping by the arms. This convergent pattern across tyrannosaurids, abelisaurids, carcharodontosaurids, megalosaurids, and ceratosaurids suggests tiny arms were an evolutionary consequence of jaw power, not a byproduct of overall gigantism.
New research analyzing 82 theropod species links Tyrannosaurus rex’s famously tiny arms to a shift toward stronger skulls and bites. As jaws became more powerful, forelimbs became less useful, a pattern seen in several carnivorous lineages and driven more by skull robustness than overall body size.
Paleontologists in Torotoro National Park, Bolivia, have documented Carreras Pampa as the largest known dinosaur tracksite, preserving nearly 18,000 footprints across 1,321 trackways dating to about 70 million years ago along the shore of an ancient freshwater lake. Most prints are three-toed theropod tracks, with ghost tracks and hundreds of swim traces; no bones were found. The site offers detailed clues on dinosaur movement and behavior and was published in PLOS ONE.
T. rex arms were about 1 meter long, roughly 30% of the leg length, prompting several hypotheses about their function—from display and prey handling to balance as skulls grew larger—with no consensus. Some scientists view the arms as vestigial or a byproduct of skull enlargement; others suggest a defensive or ecological role in crowded feeding scenarios. Ongoing fossil research may yet reveal why this tiny-arm trend occurred repeatedly in theropods.
In southern France’s Mèze area, paleontologists uncovered a fossil-rich horizon containing more than 100 dinosaur eggs dating to about 70–72 million years ago, indicating multiple species used the site for nesting, including titanosaurs and smaller dinosaurs such as ankylosaurs or theropods; exceptional preservation in clay marls and flood deposits allowed eggs to fossilize, and the museum on site now protects and showcases these discoveries.
The Carreras Pampa site in Bolivia, the largest dinosaur tracksite ever found, contains nearly 18,000 tracks from around 70 million years ago, offering unique insights into dinosaur behavior and preservation due to exceptional environmental conditions that captured footprints, tail marks, and swimming traces of theropods, making it a significant paleontological discovery.
A study analyzing 18 theropod dinosaur skulls reveals diverse feeding strategies among giant carnivorous dinosaurs, with some like T. rex optimized for powerful bites, while others like Giganotosaurus had lighter bites, indicating a wide range of ecological adaptations and less competition among these predators.
A study analyzing fossilized skulls of large theropod dinosaurs reveals diverse hunting strategies, with Tyrannosaurus rex capable of crushing bones with its powerful bite, contrasting with other species like Giganotosaurus and Spinosaurus that specialized in slicing flesh or catching fish, highlighting complex feeding behaviors among prehistoric predators.
The tiny arms of dinosaurs like T. rex have puzzled scientists for years, with various theories proposed to explain their existence. Suggestions range from mating behavior to aiding in getting up after a fall, avoiding accidental amputation, and even using them as weapons. Some believe the arms served no purpose and were simply a relic from their ancestors. Future research and fossil discoveries may shed more light on the true reason behind these absurd appendages.
Paleontologists studying bite marks on sauropod bones have concluded that the marks were likely made by scavenging meat-eating dinosaurs rather than predators that actively hunted and killed adult sauropods. The researchers found that the bite marks were more likely to be on the bones of old, sick, injured, or otherwise vulnerable sauropods. The study suggests that it would have been too risky for predators to try to bring down an adult sauropod, which could weigh up to 50 tons. Instead, the large theropods likely targeted and consumed young sauropods, which were more defenseless.
Paleontologists studying bite marks on sauropod bones from the Jurassic Period have concluded that the marks were likely made by scavenging meat-eating dinosaurs rather than predators that actively hunted and killed adult sauropods. The researchers found deep grooves on 68 out of 600 bones examined, suggesting that the scavengers came across the bodies of sauropods that had already died from causes like old age or infirmity. The study also revealed that adult sauropods were likely not targeted by predators due to their massive size and the potential risk involved in attacking them. Instead, predators may have focused on young sauropods, which were more vulnerable.