For owls, as with most other birds, the period during nesting and rearing
young is the most important of the annual cycle. It is the time during
which genes are passed on to the next generation, and considerable effort
is expended by the parents in this respect.
A Great Horned Owl and nestlings.
In the case of most owl species, especially those found in temperate or
sub-Arctic regions, breeding occurs during the spring. However, all the
upbringing of their young, and the period immediately following their
fledgings, is invariably timed to coincide with the maximum abundance
of prey animals.
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