Version 0.28: This article may not be up to date for the latest stable release of Crawl.
Blood temperature is a trait of all monsters which have blood (most natural, non-insect, -arachnid, -jelly, or -eyeball monsters).
They can be either cold-blooded or warm-blooded.
Cold-blooded creatures are slowed if hit by a cold attack and are slowed twice as long by Metabolic Englaciation.
Warm-blooded creatures have no specific vulnerabilities.