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egg — usually at dawn — until she feels she has achieved the number — her clutch — nature has prescribed. She will not begin incubation — pressing her warm, blood-filled breast against the eggs -— until the clutch is complete though she may remain on the eggs to protect them from rain or very cold weather. Incubation is a serious, continual business. It is essential that the temperature of the eggs be kept constant. The male often feeds the incubating female.
The reason for waiting until all eggs are laid before beginning incubation is clear: All of the eggs should hatch at one time and they do, within hours of each other. The pink blob emerging from an egg has no feathers, is blind, and
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