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# Owl Pellets - page 2 / 4

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Questions and Conclusions  (Show ALL Work)

1.If a barn owl produces one pellet each day, use your average prey per pellet to estimate how much food the owl would eat in a year.

2.

The average adult barn owl requires 80 to 100 grams of food daily.  The average barn owl weighs 300 grams.  What is the percentage of its weight that a barn owl must consume daily to survive?   (weight of prey / weight of owl) x 100% =  % of weight

3.

Study the following graph:

a.

What do the white peaks represent?

b.

Describe what causes the difference in shape between the sharp white peaks, the gray striped humps and the smooth black curve.

c.

Right on the above graph, draw what you think the vole and mouse population looks like.  Explain your drawing.

Use the following facts to solve the next set of problems:

Algae zooplankton trout eagle

A bald eagle weighs 1,200 grams and eats 1,000 grams of trout each week

Each trout weighs 20 grams and eats 35 grams of zooplankton each week

Each zooplankton weighs 0.1 gram and eats 1.5 grams of algae each week

4. How many trout will it take to feed one eagle for a week?

5. How many zooplankton will it take to feed one trout for a week?

6. How many zooplankton are needed to feed the number of trout eaten by one eagle in a week?

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