Tiny T. rex Hatchlings Rewrite Dinosaur Parenting Playbook
New fossil analysis shows T. rex hatchlings were cat-sized (about 75 cm long and roughly 1.7–2.5 kg), hatched from large clutches of 20–30 eggs, and bore features similar to adults. This suggests tyrannosaurs had a high-offspring, lower-parental-investment strategy (an r-strategy) rather than the long-held view of extensive parental care, signaling a transitional pattern between reptiles and birds.