Caroline Arnold - Hatching Chicks in Room 6

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C A R O L I N E A R N O L D

WRITTEN AND PHOTOGRAPHED BY

Mrs. Best keeps chickens in her backyard.

Every day the hens lay eggs. Every day Mrs.

Best collects the eggs for her family to eat.

But today Mrs. Best is bringing the eggs

to school.

Many chicken eggs

are white. Eggshells can

also be brown, green, blue, or

speckled. The color depends

on the type of chicken.

Mrs. Best is a teacher. The children in her

class are learning about chicks and how

they grow from eggs.

A hen lays her eggs in a nest. If she sits

on them for twenty-one days, the eggs

hatch into chicks.

A hen keeps her

eggs warm and moist

and turns them with her

feet and beak.

An eggshell protects the

growing chick inside.

The children put the eggs in an incubator.

They look through the plastic cover and

watch the eggs move on the turning rack.

Water drips into the

incubator and

makes the air moist.

This keeps the lining

inside the eggs from

drying out.

A heater

keeps the

air warm.

A motor

moves the

rack. This

turns the eggs

and keeps the growing

chicks from getting stuck

on one side of the shell.

The eggs went into the incubator on Day

They will hatch on Day While the children

wait for the eggs to hatch, they count the

days and learn about chickens and eggs.

A chickens life cycle begins with a fertile

egg. You need a hen and rooster to make

a fertile egg. A hen is a female chicken.

A rooster is a male chicken.

A chick starts growing when the egg goes

into the incubator. Each day the chick grows

a lile bigger.

The skin on top of a

chickens head is called a

comb. The flap of skin under

the chin is a wattle. Roosters

have bigger combs and wattles

than hens do.

hen

rooster

A thin skin called the

membrane holds the

egg white together.

At the large end

of the egg, there

is an air sac

between the

membrane and

the shell.

The clear part of an

egg is called the egg

white, or albumen. It

cushions the embryo.

The yellow part of

an egg is the yolk.

The yolk of a fertile

egg has a small,

white circle that

looks like a bulls-

eye. In an incubated

egg, it will grow into

a chick. A chick

growing inside the

shell is called an

embryo. The yolk is

food for the embryo.

On Day Mrs. Best takes an egg out of

the incubator and puts it on top of a bright

light. Then she turns o the lights in the

room to make it dark. A shadow shows the

shape of the chick inside the shell. Thin red

lines show blood vessels that are bringing

food from the yolk to the chick.

By the time the chick is done growing,

it will ll the whole shell except for the air

sac at the end.

Shining a light

through an egg is

called candling.

The dark part is

the shadow of

the chicks body.

On Day Mrs. Best shuts o the motor

that turns the eggs in the incubator. Now

the eggs must stay still. The chicks inside

the eggs are almost done growing.

On Day the chicks poke a hole into

the air sac inside their shells. They breathe

air for the rst time.

Peep, peep, they call.

The children listen carefully. They can

hear the chicks calling.

Just one more day until they hatch!

The chicks turn inside

their shells to face up

as they hatch.

Day Hatching day!

In the morning the children see small

holes in some of the eggs. Soon other eggs

have holes, too. Each chick has a sharp knob

called an egg tooth on the top of its beak.

The chick taps it against the shell to make

the rst hole, called a pip.

An eggshell is strong. It is hard to break

open. The chick rests a while aer pipping.

Then it starts to tap again.

Most chicks hatch twelve

to eighteen hours after

they pip, but the time for

some is longer or shorter.

The chick slowly pecks a circle

around the inside of its shell.

Little by little, the shell begins

to crack. It is like unzipping

a zipper.

pip

The chick is curled up like a ball inside its

shell. It lies on its back and pushes with its

head and feet. Finally, many hours aer

pipping, the chick pushes one more time

and the shell pops open.

The chick has hatched!

One by one, the eggs hatch. Some chicks

Next page

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