Do birds die? Well the answer is no, they don't.
Birds have feathers, that's how they keep warm.
yes they can control their body temperature
answer these questions....
Vertebrates regulate their body temperature through a process called thermoregulation. This can involve behaviors like seeking shade or sun, and physiological processes like shivering or sweating. Some vertebrates are able to maintain a constant body temperature regardless of the external environment (endotherms), while others rely on their surroundings to regulate their temperature (ectotherms).
water proof feathers
They are essential for flight and to maintain body temperature
Control of body temperature is important for maintaining homeostasis.
Down feathers are located underneath contour feathers. They are fluffy and provide insulation to help birds regulate their body temperature.
Not all vertebrates are warm blooded. Vertebrate and invertebrate are terms that refer to whether or not the animal has a back bone, and has nothing to do with how their body temperature is controlled. Fish and frogs for example, are both animals with vertebrates (with backbones), but they are cold blooded animals, as their body temperature fluctuates with their environment.
Down feathers are feathers that lie under a birds body and primary feathers. These feathers are small and puffy, and trap warm air under a bird's feathers.
Ectothermic vertebrates include all classes of fish, amphibians, and reptiles. They rely on external sources of heat to maintain their body temperature. This is in contrast to endothermic vertebrates, such as birds and mammals, which can regulate their body temperature internally.
Down feathers are the feathers closest to a birds body, they need them to maintain the right temperature. An animals fur is there to lock in heat.
Animals that do not control their body temperature but rather let the environmental temperature control it are called cold-blooded or the technical term is ectotherm.