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yes birds do hatch from eggs
Birds Sit on their eggs to keep them warm, and to hide and protect them from predetors.
so that their baby's will develop properly , if your told its to keep them warm its wrong , ( birds sit on the eggs to keep them warm).
Most birds lay on their eggs to keep them warm and safe.
all birds lay eggs
Penguins and Birds both have beaks and lay eggs they also keep their eggs warm by there fethers
Warm blooded animals which lay eggs are birds and monotremes.All birds lay eggs.Monotremes are a small group of mammals which lay eggs. This group is made up of only the platypus and the two species of echidna.
When birds lay eggs they usually sit on them and keep them warm. Just like when a human is pregnant, our baby stays warm inside our body. If we freeze to death outside, our baby would die. If the eggs aren't kept at the temperature of the parents they wont be warm enough and they baby birds will not grow inside.
Birds believe that once something has touched their eggs, the eggs are no more clean, so they throw them off. This is not just with Love Birds but with all kinds of birds.
incubating eggs means keeping them warm ready to be hatched
To keep both sides warm!
Throw them away. What else??? :-/