yes they can control their body temperature
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).
Do birds die? Well the answer is no, they don't. Birds have feathers, that's how they keep warm.
Control of body temperature is important for maintaining homeostasis.
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.
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.
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.
Cold blooded vertebrates are animals which can't adjust their body temperature by themselves through sweating or shivering. All reptiles are considered cold-blooded.
Homeostasis.
The sweat glands control body temperature.
by swimmingThe turtle, a cold blooded animal, does not control its body temperature, It takes on the temperature of its surrounding environment.
All animals use the environment to control their temperature