Birds can also fly because they __________________________. Choose the best answer.

• have muscles

• have a heart

• are very light weight

• have lungs

A bird's feathers grow directly out of a bird's ____________________. Choose the best answer.

• wings

• skin

• muscles

• bones

Penguins move with the most ease ______________________.

• in the air

• on land

• in the water

• sliding on ice

Big wings give a bird more ___________________ to let it fly.

• weight

• movement

• muscles

• lift

Birds can fly because the air flowing ____________________ their wings doesn't push on them as much as the air flowing underneath their wings.

• over

• under

• through

• to the side of

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Birds tend to have their eyes set ______________________.

• together to face forward

• in the front of their head

• on the sides of their head to see to the side

• on the sides of their head to see backwards and forwards

There are more varieties of birds in the world then there are __________________________.

• reptiles

• fish

• mammals

• invertebrates

Birds use energy at about ______ times the rate of land animals.

• 10

• 20

• 30

• 40

Emus use their feathers to _________________________.

• line their nests

• fly

• block out the sun

• distract predators

__________________ birds can fly.

• All

• Not all

• Large

• Small