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I believe are called incubating birds, because they are incubating the eggs!
Incubating the eggs was necessary for their survival.
No. During the time the male emu is incubating the eggs, he neither eats nor drinks. He does not leave the nest at all.
incubating eggs means keeping them warm ready to be hatched
If she has definitely stopped sitting on the eggs, then throw them out.
Actually you can as long, as you don't handle them to long.
They look the same as normal eggs but the things inside are different.
about ten at a time
Ostrich nests are not "made" out of anything. They are instead constructed by a male by the digging out a shallow pit in the dirt where the community's female ostriches then lay the eggs. The dominant female of the group may discard some of the other ostriches's eggs when it is her time to lay. They are used as a community base for the eggs with the females incubating them by day and the males incubating them by night.
Ostrich nests are not "made" out of anything. They are instead constructed by a male by the digging out a shallow pit in the dirt where the community's female ostriches then lay the eggs. The dominant female of the group may discard some of the other ostriches's eggs when it is her time to lay. They are used as a community base for the eggs with the females incubating them by day and the males incubating them by night.
shivering thermogenesis
None.