No.
Being a mammal, the echidna is an endotherm, or what used to be commonly called "warm-blooded". Endotherms regulate their body temperature via their own metabolism.
Ectotherms used to be known as "cold-blooded". Ectotherms rely on the external environment to control their body temperature, and include reptiles and fish.
ectotherm
An ectotherm
ectotherm
A goldfish is an ectotherm.
It's an ectotherm
They are poikilothermic ectotherms.
Jellyfish have no blood.
ectotherm.....
An ectotherm, meaning it relies on external temperatures.
A starfish is a ectotherm. (ectotherm means cold blooded)
A snake is a vertebrate and is an ectotherm (cold-blooded) like most reptiles.
I think it's ectothermic but I'm not 100% about 95%.