It is always preferable to use a broody hen. Hens don't care where the eggs came from, once they go broody, they will sit on a Golf ball. You can put eggs from other birds under the hen. When a brood hen is unavailable then an artificial incubator is the next best thing. Incubators are available from all feed and grain supply stores and on-line for under $100.
an egg incubator
Common cuckoos do not build their own nests or incubate their eggs. Instead, they lay their eggs in the nests of other bird species and rely on the host bird to incubate the eggs and raise the cuckoo chick.
NO salmon dont incubate their eggs, fish dont incubate their eggs at all, they lay them and the male fish swims by the fish and releases the sperm near the eggs and they become fertilized outside of the female fish.
Both Female and Male Eagles incubate the eggs. They actually take turns.
yes
yes
Hello, you should incubate the eggs at around 84 degrees F :)
Incubating the eggs was necessary for their survival.
When they have hatched otherwise they will die!!!
yes
You didn't give a specific type of heron in your question, but Great Blue Herons usually incubate their eggs for 26-29 days.
Don't do that, the temperature is too high and not suitable for eggs incubation.