Emma Huddleston - How Birds Fly
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- Book:How Birds Fly
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- Publisher:ABDO Publishing Company
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- Year:2021
- Rating:5 / 5
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Birds
Fly
DAVID HU, PHD
PROFESSOR
MECHANICAL ENGINEERING
GEORGIA TECH
abdobooks.com
Consulting Group, Inc. International copyrights reserved in all countries. No part of this book may be reproduced in any form
without written permission from the publisher. Kids Core is a trademark and logo of Abdo Publishing.
20, 29 (top); Ken Canning/iStockphoto, 10; Bachkova Natalia/Shutterstock Images, 1213; Steve Byland/Shutterstock Images,
15; Red Line Editorial, 16; Natalia Paklina/Shutterstock Images, 19; Abdul Rauf Khan/Shutterstock Images, 2223; Nick Vorobey/
Shutterstock Images, 25; Ondrej Prosicky/Shutterstock Images, 26; Don Mammoser/Shutterstock Images, 2829; DMS Foto/
Shutterstock Images, 29 (bottom)
Series Designer: Ryan Gale
and index.
questions, etc--Juvenile literature. | Habits and behavior--Juvenile literature.
North America.
through
the Air
branch. With a few powerful
beats of its wings, the hawk takes
flight. It keeps flapping its wings
to fly through the air. Then it spots
a mouse on the ground.
wings, and folds both wings slightly back. Its tail
is fanned out for steering. The hawk dives down
to snatch up its prey.
lifestyle. Hawks and other birds of prey often
have wings that come to a point at the tips.
The slots between feathers help them glide.
The feathers catch rising warm air. This keeps
the bird in the air. The birds can also twist
and move between trees to hunt or to escape
being hunted.
pointed wings that are as big as their bodies.
Their wings are strong and quick. They can flit
from branch to branch and avoid predators.
Other birds with wings much longer than their
bodies glide through the air. They dont beat
their wings often or fly at high speeds. Flapping
such large wings takes a lot of energy. Gliding
is easier.
temperature or wind changes.
They stay safe by flying low when
rain or storms are coming. When the
weather is clear, they fly higher.
time on the ground.
18,000 species of birds. The heaviest flying bird
is the kori bustard. It lives in southern Africa and
can weigh up to 42 pounds (19 kg).
hover in place.
hummingbird. It is only 2 inches (5 cm) long.
It weighs 0.07 ounces (1.95 g). That is about as
heavy as two large paperclips. Science explains
how birds big and small can fly through
the skies.
any new information about red-tailed
hawks that wasnt in Chapter One?
easier for birds to fly.
against
Gravity
work when a bird flies. Gravity
is a force that pulls objects
down to Earth. It takes more
energy to lift heavy objects
against gravity than light ones.
Birds bodies are lightweight.
some other land animals.
fly. They need other forces to keep them in the
sky. The shape of their bodies helps them use
those forces.
start flying. They may drop from nests
or jump from tree branches. Birds that
live in water habitats often kick their
legs to push off from the water into the
air. For example, the noisy, splashing
takeoff of swans shows them working
hard to get into the air.
Thrust causes an object to travel forward.
Birds use their muscles to flap their wings. This
creates thrust.
Lifts Up
downward. This causes the wing to move upward, in the
opposite direction of the air.
This force is called lift. It is caused by air flowing
past a birds wings. Air may look empty. But it
is filled with particles , or tiny pieces of things
help a bird fly.
The birds forward movement forces air flowing
under the wing downward.
downward, it pushes
more air than if it held
its wings still.
force that pushes the bird upward. Flapping
pushes even more air under the wings.
Their wings push a lot of air downward. The
wandering albatross has the longest wingspan.
Its wingspan is up to 11.8 feet (3.6 m) wide. The
bird can travel thousands of miles by soaring .
the open ocean.
for food.
its wings. The warm air currents under its wings
support it. Soaring is helpful for large birds
because a heavy bird uses lots of energy to fly.
Source
and weight determine how a bird flies:
for long periods.... They are usually soaring
animals, which means that they use... other
energy sources to stay aloft for long periods
of time.
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