a bee has a large sting at the end of the insect and it uses that to defend it's self and it can use it for stinging enimies.
Their sting.
An ox will use its horns, head, hooves, and weight to kill the enemy or defend itself.
Dogs use their teeth and strong jaws to defend themselves.
It sprays people
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A porcupine uses the spikes on its back to protect itself.
they use their long legs to kick.
The Amazon Parrot defends itself by roosting high in trees. It can also fly away if needed. If it has no choice, it can use its beak and nails to defend itself.
they use there special ink to defend them selves
It doesn't look like Iran is trying to defend itself, Mahmoud Ahmadinejad is theatening to use nuclear weapons against Israel.
A flower may have thorns such as a rose does enabling it to passively defend itself .
it kill itself