echidna

[8] The echidnas' sex can be inferred from their size, as males are 25% larger than females on average.

The average lifespan of an echidna in the wild is estimated around 14–16 years.

If you see a headline that says "Belgians are going crazy about a roller-blading echidna", you should be asking "How many Belgians?".

The surviving monotremes are the platypus and several species of echidna.

> "And another minor point, we know of divergent evolution for things as complex as large animals, like echidnas and hedgehogs.

* How can echidnas cure cancer?The challenge is that many revolutionary products sound equally nonsensical at the time.

The echidnas are woodland animals without any particular aquatic adaptations.

Also consider the sheer number of creatures that went extinct here, everything from Marsupial Lions to gigantic emus and echidnas, it doesn't match up with indigenous australians hunting behaviours that somehow they decided to overkill for this short period of time all these larger creatures, and then that behaviour suddenly stopped?

I would also take care that it never enters a failure mode that involves exposing its power core, CPU, or other delicate parts; and I would license Tony Stark's arc-reactor technology to power it, as the very rare mystical gems I would otherwise need tend to be either highly sought after by ambitious hedgehogs or guarded by fierce echidnas who would stop at nothing to ensure their safety and sanctity.