so a couple things got me thinking here,the first being the red kangaroo who not only must seek shade during the heat of the day but also licks its fore paws too cool its own blood,I realize it does this too survive the heat but it set me thinking about the other side,the cooler temps,so I started looking at range maps and temp changes in those ranges,rainfall etc.anyway I guess the question here is are these animals just surviving the cooler temps in there habitat or are they needed in some way?I continueously see temps no lower then 80 recommended for leopards but in there natural range the climate changes and can be as low as 50 derees for extended periods.so again are they just surving in these periods or is this cool down necessary for them in some way we see plenty of theory on optimal temps at the high side but is there an optimal temp at the low end as well? thanks john