Medium-size dinos are missing from the fossil record. Here’s why. – Livescience.com

Medium-size meat-eating dinosaurs
are missing from the fossil record, and paleontologists think they’ve figured out why. 
Paleontologists have discovered gargantuan dinosaurs and wee dinosaurs, but a new study finds that there’s a conspicuous lack of medium-size carnivorous dinosaur species, especially from the Cretacous period
(145.5 million to 65.5 million years ago). 
Donning their detective hats, the researchers soon found a suspect; megatheropods the largest of the meat-eating dinosaurs,…

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