Raptors and Owl Exercise

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OWLS and Raptors (including falcons)
Instructions: As a follow-up to our visit at the Raptor Trust please do the following.
1. Set up a “data base” for raptors and owls following the example below (which is set up for gulls & terns: just replace these for raptors and owls)
2. Generate the 3 graphs shown below for your data, you can do this either in Excel or by hand on “math” paper
3. Start to think about what these graphs might show you in terms of the feeding ecology of raptors & owls. We will discuss this in class.
4. Please hand in the 2 graphs after Thanksgiving.
Size distribution in Gulls and Terns (data from Sibley’s field Guide)
all
Weight
62
120
180
180
190
270
280
320
400
420
520
630
800
820
1150
1400
1650
42
100
110
110
120
160
170
180
200
210
470
660
Gulls
Gulls
Terns
Length Gulls Wingspan Length
9.75
24
11
24
13.5
33
13.5
33
13.5
33
16
40
14.5
36
16.5
40
17
36
16
43
17.5
48
17
37
21
54
22
54
25
58
27
60
30
65
9
15
12
12.5
12
13
14
16
15.5
15
20
21
Terns
Terns Wingspan
GRAPH 1: Mass by Wing span: separate for Gulls and Terns
95
85
75
Wing span (inch)
Species
Black Tern
Little Gull
Ross’s Gull
Sabine’s Gull
Bonaparte’s Gull
Black-headed Gull
Franklin’s Gull
Laughing Gull
Black-legged Kittiwake
Mew Gull
Ring-billed Gull
Ivory Gull
Lesser Black-backed Gull
Iceland Gull
Herring Gull
Glaucous Gul
Great Black-backed Gull
Least Tern
Bridled Tern
Arctic Tern
Roseate Tern
Common Tern
Forster’s Tern
Gull-billed Tern
Sooty Teren
Brown Noddy
Sandwich Tern
Royal Tern
Caspian Tern
20
30
31
29
30
31
34
32
32
34
41
50
65
55
45
Gulls Wingspan
Terns Wingspan
35
25
15
0
500
1000
1500
Weight (g)
GRAPH 2: Histogram (weight classes) for Gulls and
Terns separately
Hint: a histogram devides the data in weight classes (chose
at least 10 different ones that make sense for your data)
and count the number of species that fall into these classes.
Do this for raptors and owls separately
and use the same size classes for both raptors and owls (so
you can compare the histograms).
2000

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