I built an H13 for BM this year, and of the names mentioned here,
armadillo seems to ring as closest to the H13. Pangolins are really
cool but, they're smaller than armadillos, and the H13 is taller/more
roomy than i.e. the H12 and other similar yurts. And of course the
metallic appearance of the H13 (with NO logos outside) gives it that
armored appearance (the one panel that has to have logos out, I
painted with silver paint to cover up the logos).
Though turtle or tortoise also strikes home for me because when the
turtle/tortoise's head emerges from its shell, it reminds me of waking
up and emerging from my H13 each morning to start a new day. Not only
are tortoises prehistoric, but they're of the few surviving creatures
today that have survived from those ancient times, ergo it's a
creature that could be said to define "sustainability". My favorite
is the Galápagos Tortoise, with life spans of over 100 years (a
captive one lived for 170!). If the whole name seems too long, we
could officially call it its full name, but when referring to it in
casual conversation/chat/emails, just shorten it to just "the
Galápagos".
Then again dragons are cool too, though somewhat large.
-Alejandro