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pennen

Pennen, also known as pennae, are the external, visible parts of the wings of insects, birds, and some other animals. In insects, pennae are the primary structures for flight, while in birds, they are the primary structures for flight and display. The term "pennae" is derived from the Latin word "penna," which means "feather."

In insects, pennae are typically composed of a series of segments, each with a set of bristles

The shape and size of pennae can vary greatly among different species, and they can be used

Pennen are a fascinating and diverse group of structures, found in a wide range of animals and

or
hairs
called
setae.
The
number
of
segments
and
the
arrangement
of
setae
can
vary
greatly
among
different
species.
In
birds,
pennae
are
composed
of
a
series
of
feathers,
each
with
a
shaft
and
a
series
of
barbs
that
interlock
to
form
a
strong,
lightweight
structure.
for
a
variety
of
purposes
in
addition
to
flight.
For
example,
some
insects
use
their
pennae
for
sensing
the
environment,
while
some
birds
use
their
pennae
for
display
and
courtship
rituals.
In
some
cases,
pennae
can
also
be
modified
for
other
functions,
such
as
defense
or
communication.
serving
a
variety
of
important
functions.
Their
study
can
provide
valuable
insights
into
the
evolution
and
diversity
of
life
on
Earth.