Flying birds have a thick coat of down and feathers that protect
their body a specialized circulatory system constricts blood flow
to their specialized versatile feet, and a digestive system quickly
converts food into energy that begins with the bill. Migration is
genetic with cold weather destroying food. Alterations in
temperature and light stimulate the pituitary and adrenal glands
into releasing two hormones that encourage fat storage for fuel
used in migrating. Birds that fly have the abilities to learn and
use tools to solve problems. The brain in humans and birds is the
seat of the mind which interacts with the body through the senses
and muscles. It receives sensory information from eyes and ears.
The sensor cells in the nervous system transition external stimuli
into electrical impulses that are conducted through the sensory
nerves to regions in the brain. Penguins are genetically programmed
to walk in single file 70 or more miles from the ocean to their
rookeries where they meet their mates, build nest, lay eggs and
hatch their young keeping the egg warm while the other mate walks
back to the sea to eat and get food to bring back to the young.
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