It would be very unlikely that these
dinosaurs remained in their nests for such a long period of
time. What is more probable according to Horner is that
these creatures were warm-blooded. Their growth rate being
compared to that of an ostrich, one of the slowest growing
warm-blooded creatures. An ostrich achieves a length of
about one meter in six to eight months. Since the young
Maiasaurs seemed able to grow this fast or faster, Horner
and many others believe it is very likely that they were
warm-blooded creatures.
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