I was there 1971-76 and we were told not to get near the cats coz they were radioactive- They were up in the cable trays near the ceilings coz it was warmer up there during the winter when they came in to get warm; The cats were near all the REM generating equipment from accelerators to boxcars to fusion target areas. There were holes in the perimeter fences they could crawl thru real easily, not to mention all the gates that had gaps wide enough for a cat to squeeze thru; saw the one-eared jackrabbits. There were also bats and birds flying in building 81 which was as long as a football field. They were probably hot too. been there done that.
Hey, that’s all kinda cool! :’) But I’m a freak. Nice not to have to microwave one’s lunch...