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> Four-chambered heart first, endothermy later. (Note that no extant endotherms
> have three-chambered hearts, but one group of extant ectotherms--crocs--has
> four-chambered hearts.)
_Heterocephalus glaber_, the naked mole rat, was shown in 1993 to be a truly
*ectothermic* mammal. It too has a 4-chambered heart.
"How do I get this off my fingers as quickly as possible without betraying my