2. FISH
live in both fresh and salted water
generally they are cold-blood vertebrates
most of them breathe with gills, and have scales and fins
3 main parts of their bodies are: head, trunk, tail
an important organ for fish is the swim bladder, acts as a gas
bag and control the fish’s depth. Changing the volume of the
gas in the bladder helps the fish go up and down in the
water
have a sense organ called the lateral line helps the fish
to feel nearby movements and changes in pressure
reproduce by laying eggs
3. CARP
Appearance: the skin is slimy and
cover with scales. The slime on
their skin aids in swimming and
offers protection. They have
streamlined bodies with 3 main
part: head, trunk, tail. Their length
are from 30-60 cm and weight 0.5-
4kg, but some carp reach 15-20 kg.
Eating habits: they feed on aquatic
plants, algae, insects, worms, snails,
aquatic crustaceans. They are
omnivores.
Life cycle: carp can spawn from
May to August depending upon the
climate. The females scatter their
eggs in the water among the plants.
An average-sized female carp can
produce up to 300,000 eggs.
4. CATFISH
Appearance: catfish have no scales. Its
skin is slimy and greyish brown. It has a
large, flat head and there are barbels on
both sides of its mouth. Its body is rounded
and its tail is flat and elongated. It can
grow as 2 m.
Eating habits: catfish is a carnivore. During
daytime it stays at the bottom of the water.
It hunts at night.
5. FRESH BREAM
Appearance: The fresh bream
usually has a 30-70 cm long
body covered with silvery
scales. Adults inhabit in
backwater, shallow lakes and
slow-flowing rivers.
Eating habit: they feed on
zooplankton, plants, small
snails, worms and insects.
They are omnivores.
6. AMPHIBIANS
Animals that begin their lives in water, but develop to live on land as they
grow.
These animals are attached to ponds and rivers. Their eggs ad the young
animals need water to survive.
When the young amphibians live in water, they have gills to breathe and a tail
with a fin to swim. Later, they lose the gills and fins and develop lungs and
legs for their life on land. They are cold-blooded.
Their skin is smooth and moist and hey also partly breathe through their skin.
They hibernate in winter. Their body temperature drops and their heartbeat
slows down. When spring comes, they come out of their hiding places.
7. EDIBLE FROG
Appearance: the adults have thin, slimy skin, rich
in blood vessels. They breathe through their skin
because their lungs is not well developed. They
have a camouflage colouring.
Frog have a short body with a fused head and trunk.
Their webbed toes help them to swim. They are good
jumpers because of their long, powerful hind legs.
Eating habits: they feed on small animals like
earthworms, spiders and small insects.
Their oral cavity works as an insect trap. To catch
insects, their long, sticky tongue can be quickly
flicked out of its mouth and then snapped back in.
During winter, they hibernate in the mud at the
bottom of the pond.
8. Life Cycle of a Frog
• after the eggs hatch, the tadpoles (young
• after the eggs hatch, the tadpoles
(young frogs) live in water
• tadpoles have dark, oval bodies and a
tail with a fin
• they breathe with gills. As they grow,
they lose the gills and begin breathing
with lungs. Most species also breathe
through their skin
• growing tadpoles also lose their tail
and eventually they develop legs, then
they can leave the water to live part of
their lives and land
• frogs) live in water. Tadpoles fin. They eggs hatch, the tadpoles (y live in water. Tadpoles have dark, oval bodies and a tail with a
fin. They breathe with gills. As they grow, they lose the gills and begin breathing with lungs. Most species also breathe through their
skin. Growing tadpoles also lose their tail and eventually they develop legs. Then they can leave the water to
• poles have dark, oval bodies and a tail with a fin. They breathe with gills. As they grow, they lose the gills and begin breathing with
lungs. Most species also breathe species also breathe through their skin. Growing tadpoles also lose their tail and eventually they
develop legs. Then they can leave the water o l
9. GRASS
SNAKE
Appearance: their greyish brown body is long and
muscular. It is covered with hard and dry scales to
protect the snake while moving on hard or hot surfaces.
As it grow, the snake sheds its skin several times a year.
There are 2 light spots on the sides of their head.
They are good swimmers, but also move quickly on land.
Eating habits: snakes are carnivores. They eat rodents,
birds, frog and other reptiles. As hey cannot bite, snake
swallow their food whole. They have flexible jaw which
allow them to eat larger portions than their head size.
Senses: since most snakes have poor eyesight, they use
their sense of smell and touch. Snakes smell with their
tongue.
Life cycle: the females lay eggs. Snake eggs have a soft
leathery shell. They are incubated by the heat of the sun.
The newborn snakes look like their parents.
Snake hibernate in winter. They find shelter in cracks in the
ground where he frost can’t react them.
10. Works Cited
after the eggs hatch, the tadpoles (young frogs) live in water. Tadpoles have
dark, oval bodies and a tail with a fin. They breathe with gills. As they grow,
they lose the gills and begin breathing with lungs. Most species also breathe
through their skin. Growing tadpoles also lose their tail and eventually they
develop legs. Then they can leave the water to l
• https://infovisual.info/en/biology-animal/life-cycle-of-a-frog
• Ocsenás, Mária and Tóth, Rita: Science Book 6
