pre-adult mortality is the percentage of young individuals that have
died during the periods of emancipation and dispersion.
they go out of the nest, the young eagles are very inexpert and they
begin a life full of risks in which only the most capable and strong
survive. Likewise, this strategy of natural selection has turned out to
be altered by the changes produced by men, who are the cause that in
the last decades the pre-adult mortality is much higher. That's why
every time it is more difficult for the young eagles to come to the
adult age and be able to occupy the place of the dead adults.