University of Chicago Rodents
"Which makes you wonder about how many properties have the remains of radioactive rodents (poisoned by thallium rodenticides) littered about."
-Launderess
At the University of Chicago, where the original Enrico Fermi experiments were done, there steam tunnels with, shock shock & shock of shocks, rodents in them. I recall a story told by consulting engineers doing work for the new dormitories which are on part of the old Stagg Field (where the experiments took place, under the bleachers) were checking on radiation and found it in spades, moving around no less.
It was the rats.
They were like, oh, we can go in and get rid of them and the University was like NO WAY! They were using them as research, lab rats, on radiation half life/longevity in an animal population and were actually quite valuable. So the half life isn't just in corpses/remains but also in their living offspring!