Photograph courtesy D. Scott
The tiny footprint of a baby Massospondylus was also found at the South African nesting site.
The print suggests that the young dinosaurs "stayed around the nest after they hatched, at least until they grew about twice their size," study co-author Reisz said.
Staying put means that the newborn babies must have relied on their parents for food and protection—the "actual, real first evidence of it in the fossil" record, he said.
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