The lizard opens its mouth wide and flares out its frills when it is frightened.
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Signs of injuries detected in pachycephalosaurs' skulls offer evidence the animals head-butted in violent battles.
For snakes and lizards, gastro-intestinal woes can be a sign of a potentially fatal parasitic infection.
The strange group of worm-like amphisbaenians, which outwardly resemble snakes, is more closely related to lizards.
Once thought to be loners, at least one lizard species has been caught living in family groups called dynasties.