clearly defined, rather, there is some overlap and blurring of the limits. They can, however, be used as a general guide. Below is a graphic that gives an idea of the area the zones encompass. This data is based on an incubator with a fan that is being used to incubate chicken eggs...
Birds like robins lay blue eggs that they incubate until hatching. 5 Mammals Primarily live-bearing animals. Most mammals, unlike reptiles, give birth to live offspring. 10 Birds Possess a unique respiratory system including air sacs. The efficient oxygen exchange in birds supports their high metab...