You can ask the question a different way, why do human males produce so many sperm when it only takes one. The answer is to be sure that offspring will be produced.
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.
The eggs take 45 to 75 days to hatch.
You didn't give a specific type of heron in your question, but Great Blue Herons usually incubate their eggs for 26-29 days.
for dragonvale its 4 hours
Appx 30 days
It is usually between four and ten days but it can be for as long as 6 months
Lake trout typically have a high reproductive output, with a single female capable of producing anywhere from 30,000 to 100,000 eggs in a spawning season. The number of eggs can vary based on the size and health of the female, as well as environmental conditions. After fertilization, the eggs are laid on the lake bottom, where they incubate until hatching.
The amount of time that beetle eggs incubate varies depending on how warm the overall temperatures are and the type of beetle that laid the eggs. Typically most beetle eggs will hatch in about 5 to 14 days.
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.
A mother hummingbird incubates her eggs for about two weeks. She might incubate her eggs longer in colder climates. This is relatively long for bird incubation.
A female trout is called a 'Hen' and a male trout is called a 'Jack'.