Name:__________________
1
A
YEAR
2
3
4
5
6
7
8
9
10
11
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
Date:__________________
B
NUMBER OF
WOLVES
250
300
320
350
300
250
200
100
225
250
C
NUMBER OF ELK
450
360
250
150
150
225
300
405
390
350
1. Why might the number of elk have dropped from 1991 to 1992?
2. Why might the number of wolves have decreased from 1994 to 1995 when the number
of elk stayed the same?
3. What events might have cause the drastic decrease in wolves from 1997 to 1998?
4. What other factors beside the predator relationship might account for a population
increasing?
5. Many elk have been dying lately. There has not been an increase in the wolf
population. What else might have caused the elk to die?
6. Name three other predator/prey relationships.
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