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.
Usually one to four thousand.
3 hours a day
4 days
THEY NEVER INCUBATE THEIR EGGS BECAUSE THEY LAY THEIR EGGS IN OTHER BIRDS NESTS AND THOSE BIRDS INCUBATE THEIR EGGS AND THATS A FACT....
buleys dont lay eggs
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.
Appx 30 days
for dragonvale its 4 hours
It is usually between four and ten days but it can be for as long as 6 months
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'.