by raping them
by attacking.
they bark
they use their quills to scare them
They used them to fight and scare out predators.
they use their quills to scare them
There glowing prescence and scary attitude wards some of the predators off
by its big huge teeth
To scare away predators.
they stay in groups, and try to scare there predators away.
to scare away predators or to defend their young.
Lizards normally just ether scare an animal (for instance frilled neck lizards spike out there mains which scares many animals) or hide as they can normally camouflage (blend in with things)
with it's shrieks or screams you could say