An incubator.
Obviously the duck comes first because eggs need a mother duck to sit on them to keep it warm otherwise the baby duck still in its egg would freeze to death.
they sit on it
keep it warm and safe I guess
Duck egg incubation can be from 27 to 35 days depending on the breed.
he sits on it to keep it warm A: The father penguin uses his beak to roll the egg onto the top of his feet. He then rests his body down over it to keep it warm.
The egg will die if not kept warm in a safe place.
that is not true because if you don't sit on your egg it will get cold and the egg has to be warm to keep the baby alive inside the egg
Duck eggs should be kept at a temperature of around 99.5°F (37.5°C). This can be achieved by using an incubator or a broody duck for natural hatching. It's important to maintain a consistent temperature throughout the incubation period for successful hatching.
The pigeon sits on the egg to keep it warm and protected from prey.
The egg, when held to the inside of the wrist should feel warm. Human body temp. is 98.6F and the duck egg is supposed to be incubated at approximately 101F.
The father keeps it in his egg pouch, while the mother goes out to sea to get fish to regurgitate to the baby upon reunion. Then the father goes out to sea while the mother stays, and so on.
A mother hawk doesn't give birth to a baby hawk, it lays eggs. The baby hawk (as with birds in general) grows inside the egg and then hatches from the egg, which the hawk has been sitting on for a long peroid of time to keep the egg warm as the baby hawk grows inside the egg.