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• Check your grades – got ?s  see me
before or after school
• On a piece of paper, write the terms that
correspond to the following:
– The supporting rod that runs through the body
– The body temperature is determined by the
environment
– First vertebrate to reproduce on land
– Four characteristics of chordates
BIRDS
Class Aves
Characteristics
• Integumentary
– Feathers, bipedal (two legs covered in scales),
syrinx (song box)
• Skeletal
– Endoskeleton; hollow bones; most can fly,
large muscles for flight
Characteristics
• Circulatory
– 4 chambered heart, 2 separate loops,
Domestic pigeon
complete separation of oxygen rich and
oxygen poor blood
Right
Left
atrium
• Reproductive
Heart
Right
ventricle
atrium
Left
ventricle
Complete
division
– Internal fertilization, oviparous, amniotic eggs
with hard outer shells
P2 = slate
• What are two differences between an
amphibian and bird heart?
Characteristics
• Nervous
– Brain, adapted to quickly interpret signals,
keen sight, good hearing, poor smell and taste
• Respiratory
– Lungs & posterior air sacs for gas exchange,
air flows in a single direction, helps maintain
metabolic rate
Characteristics
Brain
• Digestive
– Beaks that are adapted to type of food they
eat, no teeth, crop, stomach, and gizzard
When a bird eats,
food moves down
the esophagus and
is stored in the crop.
Esophagus
Lung
Heart
Kidney
Crop
Air sac
• Excretory
Moistened food passes to the
stomach, a two-part chamber.
The first chamber secretes acid
and enzymes. The partially
digested food moves to the
second chamber, the gizzard.
Liver
First
chamber
of stomach
– Uric acid deposited in cloaca where water is
Undigested food is
absorbed
excreted through the
Pancreas
Large intestine
Gizzard Small
intestine
Cloaca
cloaca.
The muscular walls
of the gizzard squeeze
the contents, while small
stones grind the food.
As digestion continues,
the food moves through
the intestines.
P2 = slate
• List in order the digestive organs that food
travels through in a bird.
Characteristics
• Body Temperature
– Endothermic
• Habitat
– Land, migrate
Evolution
• Evolved from extinct reptiles
Groups of Birds
1.
2.
3.
4.
5.
6.
7.
Pelican & Relatives
Birds of Prey
Parrots
Cavity-nesting birds
Perching birds
Herons & Relatives
Ostriches & Relatives
Assignment
• Bird Observation – complete as directed
Ticket Out
• Completing & turning in Bird Observation