Crampons.
"because he was an Irish man" I don't really have any information to add to this, except to say that it is an idiotic answer. What's it supposed to mean? Perhaps a couple of minutes online might have...
No. The echidna's 'spikes' are called spines, not spikes.
Axe and Crampons(for your feet)
Caltrop
It is called a piton.
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Page Kennedy Interview
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Visit the Table Mountain in Cape Town, South Africa