I found a link to the pressure variations at Gale Crater as measured by the Curiosity Rover.
The pressure ranges from 690 to 780 pascals each Martian Day. This is above the triple point for pure water at 611 pascals. Water freezes at 32 degrees F (0 degrees C), so anytime the temps are aboe 0 degrees C, water pure water is going to exist as a liquid in that pressure range at 100 % humidity.
So, in the Summer, and at that location, the Mars soil is warm and damp near the surface and cold and damp underneath as a perchlorate brine.
This is probably why we are seeing *mud* sticking on Curi's wheels as it trudges along from one rock to another.
I've been thinking that if NASA wants to do a sample return mission, then maybe they could bring back some of the Mars Spherules and sprinkle them on Mount Rushmore as a possible "test for organics". After all, if they are "just rocks", then they shouldn't grow on anything.
Of course they could always laser zap one of these "wayward pieces of rover material", on site, and "test for organics" there as well, as a possible maintenance check on existing equipment.
Anyway.. Back to the subject at hand..
Perchlorate brines are liquid all the way down to 236 degrees Kelvin (-37 degrees Celsius).
If it turns out that the Mars Bunny is instead an indigenous life form, then it would in all likelyhood obtain nutrition from whatever is growing on the rocks and liquid nurishment from the perchlorate brines in the Martian soil. It would also have to be somewhat like a cockroach as well, since solar radiation and a thin atmosphere wouldn't bother it either. Cockroaches are best killed by squishing them with your foot. And if it is a living thing with a desire for self preservation, then it would hide where it couldn't be squished, too.
So I would say that the "cold dead" Mars point of view is one that may be on its way out for those who are not religiously or philosphically convinced that Mars is a cold dead world.