In the Jurassic Period of ancient western North America, large size was crucial for dinosaur survival. A study analyzed bite marks on sauropod bones, revealing deep grooves on 68 bones from 40 individuals out of 600 examined, shedding light on the interaction between meat-eating and plant-eating dinosaurs. Surprisingly, these marks weren’t from predators attacking live adult sauropods. Instead, the scientists suggested that meat-eaters found the bodies of sauropods that had already died from things like old age or sickness. It seemed too risky for even large predators to attack adult sauropods, which were much bigger than them. The study suggests that predators may have preyed on weakened sauropods, the largest land animals that lived from around 200 to 66 million years ago. Smaller theropod dinosaurs in the Jurassic Period, such as Allosaurus and Ceratosaurus, lived alongside sauropods. Despite their size, these theropods didn’t target adult sauropods; instead, evidence suggests they mainly preyed on young sauropods. The study proposes that the abundance of young sauropods provided a reliable food source for these theropods, indicating a preference for vulnerable prey in the Morrison Formation.