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I believe are called incubating birds, because they are incubating the eggs!
Why would you want to shake an egg particularly if it is incubating - the reply is a definite no I wouldn't shake an incubating egg
Incubating the eggs was necessary for their survival.
Pingu - 1986 Pingu Helps with Incubating 1-2 is rated/received certificates of:
Australia:G
To learn about the bacteria you are incubating by observing or experimenting.