It’s not disputed that long necked sauropod dinosaurs were the largest land animals ever to walk the Earth, but why they got so large is a debate.

Was it the nature of the food they ate?  While that was considered, skepticism remained.  But a group of researchers now argues that the plant ecologists from South Africa who suggested a plant food cause for big dinosaurs were onto something; but scientists confused two different issues in thinking about this problem; namely how much energy is in the plant with how much nitrogen is in the plant – the South African ideas were based on nitrogen content not the total energy in the plant food. 

Drs. David Wilkinson and Graeme Ruxton of  
Liverpool John Moores University

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