0.1°C gives life
The ideal example of guaranteed process stability.We do not wish to concern ourselves here with the cooking of eggs, but with the incubation time of these eggs in the wild.
In ornithology, breeding time is the time of year that birds start to mate.
In most species the female lays the fertilized eggs over a time period that stretches from within a day and up to a few weeks after pairing. "Songbirds" lay on average 5 to 8 eggs. Other species lay only 2 eggs with some species laying up to 20. The domestic hen lays 13 to 15 eggs in late spring laying one egg every couple of days.. Within three to four weeks, the nest and is full and the incubation begins. During this incubation period she then only leaves the nest once or twice a day for food and drink.
Most birds incubate their eggs themselves with only a few using the warmth from rotting vegetation or lay them as an "incubation parasites" in the nests of other birds. The location or time of incubation is not the deciding factor for successful hatching. Far more important is that the embryo inside requires an absolute constant temperature for its development. This temperature is usually higher than the environment temperature. Here the smallest change is decisive in whether the incubation is successful or not. As they are warm blooded, the bird can start and maintain embryo development using their body heat. The parent bird sits on its nest during the entire incubation process, thus ensuring a very stable temperature for their eggs. In doing so the parent bird guarantees a constant and correct "process temperature". After the chick has developed enough and can live on its own, it breaks through the eggshell and hatches.
If on Sunday morning you are not quite sure if the egg is cooked or raw, place it on a flat surface and spin it. Raw eggs stops rotating more quickly than a cooked egg. The reason for this inertial behaviour is interesting …another story!