Only long enough to spawn (deposit eggs), then she leaves. The males cover the eggs with a light cover of gravel, then they go too.
The female may be finding food/nesting materials whilst the male looks after the nest. If the female does not return after a long time then something is wrong...
The female wren does.
Sexually.
Over gravel, in cool water rivers and streams.
it is the male and female that make the nest. if there is only a male then it may be harder to build a bigger nest.
No defenitely female birds will built the nest
Female fish just lay eggs and without the fertilizer from the male the embryo in the eggs won't survive long enough to hatch. I'm not an expert, but I'm pretty sure that's how it goes. male betta fish make a nest for the female on top of the water for the female to lay the eggs inside the nest. then the male will fertilize the nest, but the female has to have a nest to lay the eggs.
About 4-5 years, depending on species. The female will only return to earth to build a nest for its young.
the male betta fish makes the nest.
leave the nest to hunt
Neither! However, a female crocodile does build a nest to incubate her eggs but she does not live in it.
in a nest