The only explanation for that is they must have been fed by the mother. That would be oldest evidence of parental care in the fossil record,
More Quotes from Robert Reisz:
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This is much more direct evidence of parental care, and it's 100 million years older than other findings suggesting dinosaurs acted this way.
Robert Reisz
These animals do not have any teeth, and since they are ready to hatch, that is strange,
Robert Reisz
Most dinosaur embryos are from the Cretaceous period (146 to 65 million years ago),
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The head is quite large. The pelvic girdle is very small. That's where most of the muscles that would be used for locomotion are located,
Robert Reisz
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