A high metabolic rate means birds can _____.
grow slowly
eat less food
produce energy quickly
sleep a lot
What shape helps birds fly easily?
streamlined
round
square
flat
A seagull’s skeleton is about _____ of its body weight.
5%
10%
15%
20%
What body part provides power for flight?
feathers
wing muscles
eyes
legs
Which feature of Archaeopteryx is similar to dinosaurs?
hollow bones
wings
feathers
teeth
What type of beak does this bird have?
flst
short think
hooked
long narrow
Birds have streamlined bodies to reduce _____.
air resistance
body weight
gravity
body heat
Look at the bird. What type of beak is this?
long narrow
spear
short thick
flat
What are bird wings adapted from?
legs
fins
tails
forelimbs
Look at the fossil. What early bird is this?
Archaeopteryx
Duck
Eagle
Seagull
Birds have large breastbones to _____.
protect the heart
store fat
hold food
anchor wing muscles
Which bone is in both bird wings and human arms?
humerus
jaw
skull
rib
Ducks have _____ beaks.
short curved
long sharp
thin pointed
broad flat
The bird’s tail helps it _____ in flight.
keep warm
eat food
sleep
change direction
Why do many bird bones have hollow spaces?
reduce weight
grow faster
store food
hold water
What food does this beak eat?
nectar
seeds
fish
insects
Wings are curved on top to create _____.
heat
sound
lift
speed
Birds are classified as _____.
vertebrates
amphibians
reptiles
insects
Hummingbirds have long narrow beaks to _____.
cut meat
drink nectar
crack seeds
catch fish
Birds evolved from _____.
fish
insects
mammals
dinosaurs
Feathers help birds to _____.
hear sounds
smell food
breathe
steer and lift
Birds that eat seeds usually have _____ beaks.
short thick
flat wide
curved sharp
long thin
Human arms and bird wings are similar because they _____.
look the same
have feathers
have the same evolutionary origin
are used for flying
How many digits does a bird wing have?
two
three
five
four
Archaeopteryx had features of both _____.
fish and birds
reptiles and birds
mammals and reptiles
insects and birds
Pelicans use their beaks to _____.
drink nectar
scoop water and fish
crack nuts
dig holes