That is actually not surprising when you think on it. An anole would be hugely muscle with little fat at all, rats being mammals need to have a fat deposits to make it through. I'd need to do a bit more reading to make a better informed comment I am quite sketchy on lipid vs fat.

I had been thinking about Royals when I commented on field studies but I applies to a handful of others as well I have not been paying attention to lab studies as much as I am interested behaviour of wild Royals at the moment.

On a side note sorry for the hyjack although I think that has occurred ages ago... have you ever tried a bio-active substrate? I am thinking of converting one of my enclosures.

Alex