Welcome to the Straight Dope Message Boards, Paul, we’re glad to have you with us.
If you are commenting on a prior column or staff report, then it’s helpful to others if you provide a link to the column or starr report that you’re commenting on. This saves other readers lots of search time, and avoids repetition. No biggie, you’ll know next time.
On 'tother hand, if you are asking a brand new question, then the appropriate forum is the one called “General Questions.” And I sort of think that’s the case here. If so, I think the Staff Report that Kat has provided a link to will answer your question – that “cold blooded” and “warm blooded” are not, in fact, scientific terms and are not mutually exclusively categories.
Under the assumption that this is actually a General Question and not a response to Cecil’s column, I am moving the thread to the appropriate forum.
Again, no biggie, as you post here more and read posts, you’ll catch on. Welcome!