cool, thanks wanderer. would endotherms and ectotherms be sub categories of homeotherms?Cold-blooded and warm-blooded are not really the preferred terms.
The more proper terms are endotherm - an animal that generates most of its heat metabolically (birds, mammals and some other animals), and ectotherm - an animal that warms up through external sources.
You are probably familiar with how endotherms such as ourselves maintain homeostasis. Ectotherms maintain homeostasis by behavior modification (for example reptiles bask in the sun when cold, and go into shade or water to cool down.)
There's also poikilotherms (internal temperature varies) and homeotherms (internal temperature is constant)