I watch all of mine very closely in the heat but Aladdin and Jasmine do seem to start getting hotter faster. But even when they are running in the house the black ones are more active. So It maybe that they are more active than the other ones and that is the reason they get hotter faster.
Shannon, I am sorry I am just now seeing this, my heart breaks with you! I know my Granny had birds and it hurt her everytime someone told her "it is just a bird". I am again so very sorry. :grouphug