Birds are warm blooded creatures, whereas reptiles are not. It means that birds, like human beings, have an automatic system of keeping the temperature of the body warm, controlled in hypothalamus in the brain. Reptiles on the other hand, including fish, amphibians and invertebrates are poikilothermic-their body temperature fluctuates with the temperature of the surroundings. As such the poikilothermic creatures do not have the to warm their eggs for hatching.
- Birds are warmed out, while reptiles storm out.
- Because birds are warm-hearted while reptiles are cold-blooded.