they sit on it
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.
The egg will die if not kept warm in a safe place.
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 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 pigeon sits on the egg to keep it warm and protected from prey.
to keep the egg warm, and to protect it.
To cover a boiled egg on an egg stand to keep it warm.
in a blanket
The Egg - another species that the duck has evolved from lays the duck egg, and the duck is born :)
No. You can not hatch an old duck egg. It must be continually kept warm and turned over from the time it is laid until it hatches. Once the duckling inside dies, it can not be revived.
You keep an egg warm without breaking it by putting it under a lamp that has about the temperature that the egg needs and with that nothing will creak not even it's shell, thank you.