Di­nos re­mained in the egg for up to 6 months

Science Illustrated - - SCIENCE UPDATE -

PALAEONTOLOGY De­pend­ing on the species, di­nosaur eggs took 3-6 months to hatch, ac­cord­ing to new re­search by Florida State Univer­sity. One fos­sil is from a pro­to­cer­atops, a di­nosaur the size of a sheep, that laid 200g eggs. The other is from a hy­pacrosaurus, a huge, beaked di­nosaur that laid 4 kg eggs the size of vol­ley­balls.

The sci­en­tists fo­cused on the newly-de­vel­oped teeth of the em­bryos, which in­clude tiny lines in­di­cat­ing daily em­bryo growth. The lines can be compared to the growth rings of trees, and sci­en­tists were able to con­clude that the pro­to­cer­atops egg took three months to hatch, whereas the hy­pacrosaurus egg took six months. The long time span in­side the eggs sur­prised the sci­en­tists, be­cause the pe­riod is very vul­ner­a­ble for both the egg and the broody mother.

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