One possible explanation for why some birds migrate as well as others maintain year round residency in single location is intelligence. Specifically, birds with small brains, relative to their body size, are simply not smart enough to determine food during the winter and should migrate to warmer climates where food is easily available (Sol, Lefebvre, & Rodriguez-Teijeiro, 2005). Birds with bigger brains, on the other hand, are more creative and can determine food even when the weather turns harsh. Following are hypothetical data similar to the actual research results. The numbers represent relative brain size for the individual birds in each sample.
|
Non-Migrating
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Short-Distance migrating
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Long-distance migrating
|
|
18
|
6
|
4
|
|
13
|
11
|
9
|
|
19
|
7
|
5
|
|
12
|
9
|
6
|
|
16
|
8
|
5
|
|
12
|
13
|
7
|
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M=15, SS=48
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M=9, SS=34
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M=6, SS=16
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Display the results in an ANOVA summary table.