1. What is an Animal?

2. There are about 1 million species of animals.
About 95 percent of them are invertebrates, animals without a backbone.
Examples: jellyfish, insects

3. Any animal with a skull and
backbone is a vertebrate.
Examples: fish, birds

4. Animals share characteristics that separate them from all other living things:
All animals are multicellular. The cells are eukaryotic and do not have a cell wall.
Animals usually use sexual reproduction. A few animals, such as sponges and sea stars, can reproduce asexually by budding or fragmentation.

5. Animals have specialized body parts
Animals have specialized body parts. When a fertilized egg cell divides to form an embryo, some cells become skin cells, others may become muscle, nerve, or bone cells. Most animals also have organs, a combination of two or more tissues.

6. Animals move. Some other organisms move, but animals are more likely to move quickly in a single direction. A few animals do not move much, such as sea anemones and clams.

7. Animals are consumers. They eat other organisms because they cannot make their own food.

8. Animal Behavior- activities that help animals stay alive
Innate behavior- doesn’t depend on learning or experience, it’s in the genes. It may be present at birth or years later.
Examples: whales can swim, birds can sing

9. Learned behavior- learned from experience or watching other animals, can modify innate behavior
For example: Humans are born knowing how to speak, but the language is learned not inherited

10. Survival Behaviors: Finding Food Predators- animals that
eat other animals
Prey- the animal
being eaten

11. Camouflage- blending in with the background

12. Defenses- horns, spines, chemicals
Animals with a chemical defense often have warning coloration

13. Seasonal Behaviors:
Some animals migrate- travel from one place to another to find food, water, or safe nesting grounds

14. Hibernation- having a period of inactivity and decreased body temperature to deal with food and water shortage.

15. Estivation- period of reduced activity in the summer, some desert squirrels and mice do in the hottest part of the summer.

16. Social Behaviors:
Communication- signal traveling from one animal to another and the receiver responds
Examples: find food, avoid enemies, protect homes, warn of danger

17. Pheromones- chemicals
Noises- sound can reach a large number of animals over a large area
Body language
Touch