Lazy, Gluttonous Dinos Were Prehistoric 'Couch Potatoes'
By Rob Quinn,  Newser Staff
Posted Jul 7, 2009 11:31 AM CDT
Unlike large mammals, dinosaurs expended little energy on chewing, according to zoologist Brian McNab.   (Shutter Stock)
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(Newser) – Dinosaurs grew to their massive sizes because of lack of exercise and easy access to food, according to a leading zoologist. Dr. Brian McNab studied large mammals for comparison and concluded that a lack of energy expenditure, combined with abundant resources and a blood temperature somewhere between warm and cold, allowed herbivores to balloon to many times the size of equivalent mammals, the Daily Telegraph reports.

"Like couch potatoes sitting within easy reach of high calorie foods, the gargantuan size of dinosaurs most likely stems from the abundance of resources available, coupled with low energy expenditures," McNab said.