Download Birds

Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
• Unlike reptiles, birds lack
that is greatly reduced in
and have a tail
• Like reptiles, birds have amniotic eggs. They also
have feet and legs that are covered with
• Birds have
modified into wings.
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Key Characteristics of Birds, continued
Feathers
• Feathers are modified reptilian scales.
cover the bird’s body and give adult birds their
shape.
• When a bird preens, it spreads oil from its
gland over its feathers, cleaning and waterproofing
them.
•
cover the body of young birds and
are found beneath the contour feathers of adults.
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Key Characteristics of Birds, continued
Strong,
• The bones of birds are thin and hollow. Some of
the bones are fused, providing
•
•
have a large breastbone with a prominent
for muscle attachment.
used in flight are attached to the
breastbone and fused
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Key Characteristics of Birds, continued
• Birds are
, which means they
generate enough heat through metabolism to
maintain a high body
• Birds have a high rate of
,
which meets the increased energy requirements of
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Key Characteristics of Birds, continued
Completely Divided
• As in the crocodilian heart, the
heart is completely divided by a
of the bird
• The
of the bird heart separates
oxygen-rich and oxygen-poor blood, meaning
that oxygen is delivered to the body cells more
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Key Characteristics of Birds, continued
Highly Efficient
• Birds have a high demand for oxygen because
they use large amounts of energy
• Air moves through a bird’s lungs in one direction. Air
connected to a bird’s lungs act as holding
tanks to enable the one-way flow of air.
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
(Do Not Draw)
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
External Structure of Birds –
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
– Bald Eagle
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
• Different
of birds are adapted for
different ways of life.
• A bird’s
, legs, and feet reveal a
great deal about its habits and diet.
• Some species of birds are highly specialized, while
others are very flexible in their
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Section 3 Characteristics and
Diversity of Birds
Adaptations of Birds, continued
Other Adaptations
• There are many o
of birds, each of
which is adapted to its particular living conditions.
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Characteristics and Diversity of
Birds
Chapter menu
Resources
Copyright © by Holt, Rinehart and Winston. All rights reserved.