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Aitchison College Academic Resources.
The length of time between ringing and trapping was recorded for each bird that was
identified before it was released.
The mean age at trapping was calculated for birds with each wing length.
The results are shown in Table 5.1.
Table 5.1
wing length at ringing / number of birds mean age at trapping /
mm trapped days
63 or less 24 253
64 72 256
65 1 297
66 1 346
67 1 349
68 1 270
69 66 237
70 or more 23 199
total = 771
(b) (i) Explain why wing length is an example of continuous variation.
(2]
(ii) Suggest a feature of reed warblers, other than wing length, that shows
continuous variation.
256
(1)