Birds are classified as _____.
amphibians
reptiles
vertebrates
insects
Birds evolved from _____.
dinosaurs
mammals
insects
fish
Archaeopteryx had features of both _____.
fish and birds
reptiles and birds
mammals and reptiles
insects and birds
Which feature of Archaeopteryx is similar to dinosaurs?
teeth
wings
hollow bones
feathers
Why do many bird bones have hollow spaces?
store food
hold water
grow faster
reduce weight
A seagull’s skeleton is about _____ of its body weight.
15%
10%
5%
20%
Birds have large breastbones to _____.
anchor wing muscles
protect the heart
store fat
hold food
Wings are curved on top to create _____.
speed
lift
sound
heat
Feathers help birds to _____.
smell food
hear sounds
steer and lift
breathe
Birds have streamlined bodies to reduce _____.
body heat
gravity
body weight
air resistance
A high metabolic rate means birds can _____.
grow slowly
eat less food
produce energy quickly
sleep a lot
The bird’s tail helps it _____ in flight.
sleep
change direction
eat food
keep warm
Human arms and bird wings are similar because they _____.
have feathers
are used for flying
have the same evolutionary origin
look the same
How many digits does a bird wing have?
four
five
three
two
Birds that eat seeds usually have _____ beaks.
flat wide
curved sharp
long thin
short thick
Hummingbirds have long narrow beaks to _____.
drink nectar
crack seeds
catch fish
cut meat
