Page 194 - Ultimate Visual Dictionary (DK)

ANIMALS

Eggs Yolk SECTION THROUGH
A CHICKEN’S EGG
Albumen (egg white)
AN EGG IS A SINGLE CELL, produced by the female, Yolk sac
with the capacity to develop into a new individual. Amnion
Shell
Development may take place inside the mother’s body Amniotic fluid
(as in most mammals) or outside, in which case the Allantoic
egg has a protective covering such as a shell. Egg yolk fluid Developing chick
nourishes the growing young. Eggs developing inside
the mother generally have little yolk, because the young
are nourished from her body. Eggs developing outside Developing wing
may also have little yolk if they are produced by animals Allantois
whose young go through a larval stage (such as a Shell membrane
caterpillar) that feeds itself while developing into
Chorioallantoic
the adult form. The shelled eggs of birds and reptiles
membrane
contain enough yolk to sustain the young until it
hatches into a juvenile version of the adult. Air sac
DOGFISH EGGS
(MERMAID’S PURSES)
VARIETY OF EGGS GIANT STICK INSECT EGGS
Developing
Egg case dogfish
Operculum
LEAF INSECT EGGS
Egg capsule
Operculum
Egg capsule

INDIAN STICK INSECT EGGS
Egg capsule
Jelly

Operculum Developing tadpole Tendril

FROG EGGS (FROG SPAWN)

HATCHING OF A QUAIL’S EGG
EGG AT THE POINT OF HATCHING CUTTING THROUGH THE EGG BREAKING OUT OF THE EGG
Shell
Chick pushes off membrane Shell
Rounded end Shell Chick the top of the shell
of egg
Pointed end
of egg
Shell

Shell
membrane
Eye
Camouflage
coloration Beak
Crack caused
by chick pecking Egg-tooth
through the shell
Crack extended by more Crack runs completely
pecking by the chick around the shell

192