Vertebrates are animals that have a backbone or spinal column, which provides support and structure to their bodies. Examples include mammals, birds, reptiles, amphibians, and fish. In contrast, invertebrates are animals that lack a backbone and have softer, more flexible bodies. This group includes insects, worms, mollusks, and spiders. Both vertebrates and invertebrates play important roles in ecosystems and have economic and scientific importance.
You are divided into two groups. Each group will choose one member to act out the animals, while the rest of the group will be the guessers. The actor will silently act out three different animals using only movements, and the group must try to guess what those animals are. You will have one minute to guess all three. The group that can name all three animals before the time runs out will be the winner.
You are divided into two groups. Each group will choose one member to act out the animals, while the rest of the group will be the guessers. The actor will silently act out three different animals using only movements, and the group must try to guess what those animals are. You will have one minute to guess all three. The group that can name all three animals before the time runs out will be the winner.
Group A: Without Backbone - starfish
- worm
- snail
Group B: With Backbone - pig
- bird/parrot
- crocodile
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Why there are animals that don't have bones?
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What do you think is our topic today?
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The 2 Characteristics of Animals
Vertebrates and Invertebrates
Animals are living organisms that: - Can move on their own
- Eat food for energy
- Breathe and grow
- Reproduce and respond to their environment
- They are part of the Kingdom Animalia.
Vertebrates are animals that have a backbone or spinal column. They also have an internal skeleton (endoskeleton).
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Examples of
Vertebrates
- dogs
- birds
- snakes
- fish
- frogs
- humans
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Classification of Vertebrates
Warm-Blood and Cold-Blood
Mammals are warm-blooded vertebrates (animals with backbones) defined by key traits: feeding young with milk from mammary glands, having hair or fur, breathing air, and possessing three middle ear bones, a diaphragm, and a specialized jawbone.
Birds are warm-blooded vertebrates (vertebrates have backbones) and are the only animals with feathers. Although all birds have wings, a few species can't fly.
Fish is a cold-blooded aquatic vertebrate with scales and gills, like a shark, a trout, or a pike.
Reptiles are a class of cold-blooded (ectothermic) vertebrates, like snakes, lizards, turtles, and crocodiles, characterized by dry, scaly skin and lungs for breathing air. They allowed to live on land and water.
Amphibians a cold-blooded vertebrate animal of a class that comprises the frogs, toads, newts, and salamanders. They are distinguished by having an aquatic gill-breathing larval stage followed (typically) by a terrestrial lung-breathing adult stage. They allowed to live on land and water.
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What Are Invertebrates?
Invertebrates are animals that do not have a backbone. Many have soft bodies or external skeletons (exoskeletons).
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Examples of Invertebrates
- insects
- jellyfish
- snails
- worms
- crabs
- octopuses
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Classification of Invertebrates
With Jointed Legs and Without Legs
With 3 Pairs of Legs These animals belong to the group insects. They do not have a backbone and have jointed legs, with exactly three pairs (six legs) attached to the thorax. Their bodies are usually divided into the head, thorax, and abdomen.
Examples: - ant
- butterfly
- grasshopper
- bee
With More Than 3 Pairs of Legs These animals are also invertebrates with jointed legs, but they have more than three pairs of legs. This group includes arachnids, crustaceans, and myriapods, which have bodies adapted for crawling, climbing, or swimming.
Examples: - spider (4 pairs of legs)
- crab (5 pairs of legs
- centipede and millipede (many pairs of legs)
Worm-Like These invertebrates have soft, long, and flexible bodies and no legs. They usually move by stretching and contracting their bodies and are commonly found in soil or water.
Examples:
Not Worm-Like These animals also lack legs but do not have long, worm-shaped bodies. Many have soft or hard outer coverings and different body forms adapted for protection or movement.
Examples: - snail
- clam
- jellyfish
- sea star
All animals — whether vertebrates or invertebrates — play important roles in maintaining the balance of ecosystems.
- Pollinators (e.g., some birds and bats help pollinate plants)
- Seed dispersers (e.g., mammals help spread seeds)
- Predators and prey that control population balance
- Food sources for humans and other animals
- Pollination (e.g., bees and butterflies help plants reproduce)
- Decomposition (e.g., worms and insects break down dead matter)
- Soil health (e.g., earthworms improve soil structure)
- Food source for many larger animals
- Biodiversity indicators (e.g., sensitive to environmental changes)
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How do these animals maintain balance of the ecosystem?
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Group 1: Sketch-it-out
Draw 2 animals that show both invertebrates and vertebrates living in one area. Choose 1 representative to explain group work.
Create a jingle about vertebrates and invertebrates. All members of the group need to sing in front.
Make a Venn diagram that shows the similarities and differences between vertebrates and invertebrates. Choose 1 representative to explain your group work.
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Nature works in balance — remove one, and all are affected
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