I had this thought while watching ducks.
Birds lay eggs and then sit on them to keep them warm until they are ready.
But why? The eggs was already inside them and it’s warm there of course.
Then I thought it may related to mamals with vaginal canal analogy but the eggs does not grow while out.
So the bird could keep it in the lay it’s just when it’s ready.
My last thought is that carrying the eggs is too dangerous for their safety or its hard to move and gather food.
Please explain 🙂
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One that hasn’t been mentioned yet is that birds usually only lay one egg at a time, taking a day or longer to make the next egg to add to the nest. They usually don’t start sitting on the eggs until they have a full nest, which depending on the species could be as little as one or as many as a dozen. While they may have enough room in their bodies to hold one egg, holding more generally isn’t possible.
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