By Jonathan Amos
Science correspondent, BBC News
Scientists have named a new dinosaur species "thunder-thighs" because of the huge thigh muscles it would have had.
Fossil remains recovered from a quarry in Utah, US, are fragmentary but enough to tell researchers the creature must have possessed extremely powerful legs.
The new species, described in the journal Acta Palaeontologica Polonica, is a sauropod - the family of dinosaurs famous for their long necks and tails.
It could have given other animals a hefty kick, say its discoverers.
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The site has been looted by commercial fossil-hunters and so scientists have probably been denied the full range of material from which to make their classification.
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more:
http://www.bbc.co.uk/news/science-environment-12542664