They die. As simply as that.
they generate their own body heat.
it depends on the animal
a platypus is a warmblooded animal because it is a mammal and like most mammals,they are warmblooded.
Any warmblooded animal like mammals. Cold-blooded animals rely on surrounding heat to heat their body, that's why you see lizards laying on the rocks in the sun.
endothermal
Reptiles are coldblooded animals.
A House Sparrow is a Warm-blooded animal
warmblooded
A warmblooded animal that maintains a constant body temperature.
No, it is a reptile so it is cold-blooded
through high metabolism
An advantage is that you don't have to rely on the sun's warmth for your body heat.