INVERTEBRATES

 How are invertebrates classified?

Invertebrates don’t have a backbone or a bone skeleton.

There are six types of invertebrates. The four most simple ones are below.

Porifera are aquatic sponges. They have pores that filter water. They use the nutrients and oxygen in the water.

Cnidaria are aquatic organisms like jellyfish, anemones and coral. Some cnidaria use their poisonous tentacles to trap other animals as food.

Jellyfish

Anemone

Coral

Annelids can be aquatic organisms or land organisms. They take in oxygen through their skin. Their long bodies are divided into rings.

Earthworm

Echinoderms are aquatic organisms without a head, such as urchins and starfish. Their tentacles allow them to move, feed and obtain oxygen.

Sea urchin

Starfishes

ECHINODERMS AND SPONGES

CNIDARIANS

ANNELIDS OR WORMS

INVERTEBRADOS MÁS VENENOSOS

TOP INVERTEBRADOS MÁS GRANDES

INVERTEBRADOS LARGOS

ANIMALES INVERTEBRADOS

VIAJE 3D A LAS PROFUNDIDADES

OUTLINE

TIME TO PLAY

MAMMALS

 What are the characteristics of mammals?

Physical appearance

Mammals look different depending on how they move. Mammals with four limbs and a tail can walk, run or climb. They are usually covered in hair or fur.

Tail

Chimpanzee climbing

Fur

Bats have wings and are the only mammals that can fly. Some mammals have fins and a tail. They swim underwater but come up to the surface to breathe. Humans are mammals. We have four limbs but no tail.

Bat

Bat flying

Dolphin

Killer whale

Humans

Body functions

All mammals breathe with their lungs. Most mammals are viviparous. All female mammals produce milk to feed their young.

Mammals have different types of teeth

depending on their diet.

• Carnivores have sharp teeth to tear apart meat and bones.

• Herbivores have flat teeth and molars to grind leaves and grass.

• Omnivores have both types of teeth for a varied diet.

Types

Mammals are classified by how the offspring develop.

Placental mammals are the largest group. The offspring forms inside the uterus of the female. An organ called the placenta provides nutrients and oxygen.

Marsupial mammals have offspring that is not fully developed. It continues to develop inside a pouchin the mother’s skin.

Monotremes lay eggs. They are mammals because the female produces milk to feed her young after they hatch.

Platypus

Echidna

CLASIFICACIÓN DE LOS MAMÍFEROS

OUTLINE

WORDLIST

TIME TO PLAY

PARA SABER MÁS SOBRE LOS MAMÍFEROS

THE PLATYPUS

EVOLUTION OF MAMMALS

EVOLUTION OF THE DOG

TOP MAMÍFEROS ACUÁTICOS

ELASMOTHERIUM SIBIRICUM AND THE UNICORN

Este rinoceronte del Pleistoceno, extinto en una época prehistórica, podría ser el origen del mito del unicornio.