Copulation is done in territory in the beginning of June.
A Lagopus mutus makes a nest with a twig and fallen leaves under Pinus pumila.
A diameter of a nest is around 150mm, and depth of a nest is around 80mm.
A Lagopus mutus makes a nest with fallen leaves for laying eggs and sits down.
Laying eggs of a Lagopus mutus takes a few days and lays eggs.
Because laying eggs of a female is cautious, it is difficult to find a nest in laying eggs.
Size of egg : A longer axis is 42-50mm. A minor axis is 29-34mm.
Color of egg : Cream includes a blackish brown point a color of an eggshell.
Number of laying eggs : 5 or 7 lay eggs. The number of laying eggs is an average of 6.
Weight of an egg : = Average is 22.8g
Birth of a young bird from an egg : A female lays the last egg in the beginning of July,
and it hatches between 20 or 23 days.
A female does hug of an egg immediately that a female finishes laying
the last egg and warms it.
In the beginning of July, a female lays a last egg,
and it hatches from 20 in 23 days.
A young bird just after hatching is around 18g.
While a female sits on an egg, a male does not approach a female,
and it is role of watch in watch ground which the territory whole area can see.
A male is cautious of an invasion male and defends territory.
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