Feeding relationships

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Slide 15

Aphids are eaten by….

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Slide 16

Ladybirds

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Slide 17

Animals that eat primary consumers are called secondary consumers

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Slide 18

So far this is a straightforward food chain

Sun → aphid → ladybird

But in reality it is more complicated than that

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Slide 19

This bird eats ladybirds and aphids

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Slide 20

This bird eats smaller birds, mice, and rabbits

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Slide 21

Mice and rabbits have other predators

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Slide 22

What will eat the frog?

What do you think the frog eats?

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Slide 23

Sometimes it’s not entirely clear who eats who!

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Slide 24

We can show what goes on with the help of a Food Web

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Slide 25

What would happen if a disease killed off many of the hawks?

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Slide 26

There will be nothing to eat the snakes, so their numbers will increase.

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Slide 27

All the frogs get eaten

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Slide 28

No frogs.

More crickets

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Slide 29

Most of the cattail gets eaten by the crickets

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Slide 30

Now the crickets don’t have enough food so their numbers go down

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Slide 31