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There are no fossils of tongues because there are no
bones in tongues. So how do we know dinosaurs had
them? The tongue is attached to bones in the throat, 
and many fossils of these have been found inside
dinosaur necks. But no-one knows for sure what
dinosaurs' tongues were like. Penguins have tongues
with small spines all over them. They are useful for
catching and holding on to slippery prey such as fish.
Perhaps fish-eating dinosaurs like Baryonyx had spiny
tongues too. Ant-eaters have incredibly long tongues
which they  push inside termite nests. The sticky,
saliva-coated surface traps masses of insects.
Insect-eating dinosaurs like Avimimus and Ornithomimus
may have had sticky tongues.

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