Animals

A world of animals

Index

Invertebrates

Vertebrates

Arthpods

Mammals

Birds

Insects

Aracnids

Reptiles

Crustaceans

Fish

Amphibians

In this unit we will learn (more) about animals, are you ready?

Vertebrate

Invertebrate

Before starting, what do you remember about animals classification?

Let's start with vertebrate animals

Vertebrate are those animals with an internal skeleton made up by many bones. They are divided into five different groups They can be viviparous or oviparous

They are classified into these five groups

Can you name two animals of each group?

Mammals

How are they?

Most of them are covered by fur

Most of them have tail

They have teeth and lips that use to suckle from their mothers

They have breasts. Females produce milk to feed their young (yes, even cetaceans)

They have limbs, which are different depending on where they live

Living style

Depending on what they eat, they can be:

Carnivorous: They eat other animals

Herbivorous: They eat plants and grass

Omnivorous: They eat both animals and plants

Most of them are viviparous

Thet ALL have lungs to breath

BIRDS

How are they?

They are covered by feathers To protect them from rain and cold

All of them have tail

They don't have teeth and their mouth is a beak

They have four limbs; two wings and two legs

Living style

Depending on what they eat, they can be:

Carnivorous: They eat other animals

Herbivorous: They eat plants and grass

Omnivorous: They eat both animals and plants

ALL of them are oviparous

They ALL have lungs to breath

Reptiles

How are they?

They are covered by scales

Some of them can lose their tail and it will grow again

Some of them also have a shell

Some of them have four legs, some others none

Living style

Most of them are carnivorous

They ALL have lungs to breath

They are oviparous (although they do not incubate or take care of the eggs)

Fish

How are they?

They are covered by scales

They have fins and tails to swim in the water

Living style

Most of them are carnivorous

They ALL have gills to breat h under the water

They are oviparous (although they do not incubate or take care of the eggs)

Amphibians

How are they?

They all have wet and bare skin

They have four limbs and some even have a tail

They have a long sticky tongue with to capture their food

Living style

All of them are carnivorous, although ....

They breath through their lungs and their skin (when it is wet)

They are oviparous, they lay the eggs in the water but do not incubate them

Most of them suffer a metamorphosis

Metamorphosis

It is the changes amphibians make from hatch to adultohood, because they are born in the water and in land when thay are aduts.

Review

Time to remeber

It is turn now for invetebrate animals

Invertebrates are boneless animals, it is, don't have bones. They are all oviparous They are classified in different groups

They are classified into these groups

Arthropods

They are separated into another classification; insects, aracnids and crustaceans

They have a protective outer skeleton and many jointed legs

Insects

How are they?

They are the largest group of arthropods

Their body is divided into three parts; head, thorax and abdomen

They ALL have antennas and 6 legs

Some of them have wings, some others don't

Some insects are, bees, flies, ants...

Arachnids

How are they?

Their body is divided into two parts; cephalothorax and abdomen

They ALL have 8 legs and no wings or antennas

Some aracnids are scorpions, spiders, ticks...

Crustaceans

How are they?

Their body is divided into two parts; cephalothorax and abdomen

They ALL have 10 legs, two antennas, but not wings

Some crustaceans are crabs, prawns..

Sponges

How are they?

They live fixed and inmobile in the bottom of the sea

Their body is full of pores (those are minute openings in a surface)

The water which is loaded with food substances,enters through those pores

Jellyfish

How are they?

They ALL live in the sea

Their body is jelly-like and bell-shaped

They have a mouth surrounded by venomous tentacles used to hunt and defend themselves

Echinoderms

How are they?

They can be starfish or urchins

Their body is covered with hard layers

They live in all parts of the ocean but mainly on the sea floor

Some are fiter feeders, but some others (Starfish) are preadators of moluscs

Worms

How are they?

They have a long soft body made up of rings and with no legs

They can live on the land (earthworms) or in the water

Mollusks

How are they?

They can be aquatic or terrestrial

They ALL have soft muscular bodies

ALMOST ALL have shells (can have one, two or be internal)

Some activities